Expand Using Pascal's Triangle (2x^3-y)^5

${(2 x^{3} - y)}^{5}$

Step 1

Pascal\'s Triangle can be displayed as such:

$1$

$1 - 1$

$1 - 2 - 1$

$1 - 3 - 3 - 1$

$1 - 4 - 6 - 4 - 1$

$1 - 5 - 10 - 10 - 5 - 1$

The triangle can be used to calculate the coefficients of the expansion of ${(a + b)}^{n}$ by taking the exponent $n$ and adding $1$ . The coefficients will correspond with line $n + 1$ of the triangle. For ${(2 x^{3} - y)}^{5}$ , $n = 5$ so the coefficients of the expansion will correspond with line $6$ .

Step 2

The expansion follows the rule ${(a + b)}^{n} = c_{0} a^{n} b^{0} + c_{1} a^{n - 1} b^{1} + c_{n - 1} a^{1} b^{n - 1} + c_{n} a^{0} b^{n}$ . The values of the coefficients, from the triangle, are $1 - 5 - 10 - 10 - 5 - 1$ .

$1 a^{5} b^{0} + 5 a^{4} b + 10 a^{3} b^{2} + 10 a^{2} b^{3} + 5 a b^{4} + 1 a^{0} b^{5}$

Step 3

Substitute the actual values of $a$ $2 x^{3}$ and $b$ $- y$ into the expression.

$1 {(2 x^{3})}^{5} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Step 4

Simplify each term.

Multiply ${(2 x^{3})}^{5}$ by $1$ .

${(2 x^{3})}^{5} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $2 x^{3}$ .

$2^{5} {(x^{3})}^{5} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $2$ to the power of $5$ .

$32 {(x^{3})}^{5} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply the exponents in ${(x^{3})}^{5}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$32 x^{3 \cdot 5} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $3$ by $5$ .

$32 x^{15} {(- y)}^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $- y$ .

$32 x^{15} ({(- 1)}^{0} y^{0}) + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Rewrite using the commutative property of multiplication.

$32 \cdot {(- 1)}^{0} x^{15} y^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Anything raised to $0$ is $1$ .

$32 \cdot 1 x^{15} y^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $32$ by $1$ .

$32 x^{15} y^{0} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Anything raised to $0$ is $1$ .

$32 x^{15} \cdot 1 + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $32$ by $1$ .

$32 x^{15} + 5 {(2 x^{3})}^{4} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $2 x^{3}$ .

$32 x^{15} + 5 (2^{4} {(x^{3})}^{4}) {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $2$ to the power of $4$ .

$32 x^{15} + 5 (16 {(x^{3})}^{4}) {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply the exponents in ${(x^{3})}^{4}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$32 x^{15} + 5 (16 x^{3 \cdot 4}) {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $3$ by $4$ .

$32 x^{15} + 5 (16 x^{12}) {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $16$ by $5$ .

$32 x^{15} + 80 x^{12} {(- y)}^{1} + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Simplify.

$32 x^{15} + 80 x^{12} (- y) + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Rewrite using the commutative property of multiplication.

$32 x^{15} + 80 \cdot - 1 x^{12} y + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $80$ by $- 1$ .

$32 x^{15} - 80 x^{12} y + 10 {(2 x^{3})}^{3} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $2 x^{3}$ .

$32 x^{15} - 80 x^{12} y + 10 (2^{3} {(x^{3})}^{3}) {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $2$ to the power of $3$ .

$32 x^{15} - 80 x^{12} y + 10 (8 {(x^{3})}^{3}) {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply the exponents in ${(x^{3})}^{3}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$32 x^{15} - 80 x^{12} y + 10 (8 x^{3 \cdot 3}) {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $3$ by $3$ .

$32 x^{15} - 80 x^{12} y + 10 (8 x^{9}) {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $8$ by $10$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} {(- y)}^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $- y$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} ({(- 1)}^{2} y^{2}) + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Rewrite using the commutative property of multiplication.

$32 x^{15} - 80 x^{12} y + 80 \cdot {(- 1)}^{2} x^{9} y^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $- 1$ to the power of $2$ .

$32 x^{15} - 80 x^{12} y + 80 \cdot 1 x^{9} y^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $80$ by $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 10 {(2 x^{3})}^{2} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $2 x^{3}$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 10 (2^{2} {(x^{3})}^{2}) {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $2$ to the power of $2$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 10 (4 {(x^{3})}^{2}) {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply the exponents in ${(x^{3})}^{2}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 10 (4 x^{3 \cdot 2}) {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $3$ by $2$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 10 (4 x^{6}) {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $4$ by $10$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 40 x^{6} {(- y)}^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $- y$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 40 x^{6} ({(- 1)}^{3} y^{3}) + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Rewrite using the commutative property of multiplication.

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 40 \cdot {(- 1)}^{3} x^{6} y^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $- 1$ to the power of $3$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} + 40 \cdot - 1 x^{6} y^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $40$ by $- 1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 5 {(2 x^{3})}^{1} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Simplify.

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 5 (2 x^{3}) {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $2$ by $5$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} {(- y)}^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $- y$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} ({(- 1)}^{4} y^{4}) + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Rewrite using the commutative property of multiplication.

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 \cdot {(- 1)}^{4} x^{3} y^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Raise $- 1$ to the power of $4$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 \cdot 1 x^{3} y^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply $10$ by $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + 1 {(2 x^{3})}^{0} {(- y)}^{5}$

Multiply ${(2 x^{3})}^{0}$ by $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + {(2 x^{3})}^{0} {(- y)}^{5}$

Apply the product rule to $2 x^{3}$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + 2^{0} {(x^{3})}^{0} {(- y)}^{5}$

Anything raised to $0$ is $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + 1 {(x^{3})}^{0} {(- y)}^{5}$

Multiply ${(x^{3})}^{0}$ by $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + {(x^{3})}^{0} {(- y)}^{5}$

Multiply the exponents in ${(x^{3})}^{0}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + x^{3 \cdot 0} {(- y)}^{5}$

Multiply $3$ by $0$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + x^{0} {(- y)}^{5}$

Anything raised to $0$ is $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + 1 {(- y)}^{5}$

Multiply ${(- y)}^{5}$ by $1$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + {(- y)}^{5}$

Apply the product rule to $- y$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} + {(- 1)}^{5} y^{5}$

Raise $- 1$ to the power of $5$ .

$32 x^{15} - 80 x^{12} y + 80 x^{9} y^{2} - 40 x^{6} y^{3} + 10 x^{3} y^{4} - y^{5}$

Expand Using Pascal's Triangle (2x^3-y)^5

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