Expand Using the Binomial Theorem (6x+2y)^3

${(6 x + 2 y)}^{3}$

Step 1

Use the binomial expansion theorem to find each term. The binomial theorem states ${(a + b)}^{n} = \sum_{k = 0}^{n} n C k \cdot (a^{n - k} b^{k})$ .

$\sum_{k = 0}^{3} \frac{3!}{(3 - k)! k!} \cdot {(6 x)}^{3 - k} \cdot {(2 y)}^{k}$

Step 2

Expand the summation.

$\frac{3!}{(3 - 0)! 0!} \cdot {(6 x)}^{3 - 0} \cdot {(2 y)}^{0} + \frac{3!}{(3 - 1)! 1!} \cdot {(6 x)}^{3 - 1} \cdot {(2 y)}^{1} + \frac{3!}{(3 - 2)! 2!} \cdot {(6 x)}^{3 - 2} \cdot {(2 y)}^{2} + \frac{3!}{(3 - 3)! 3!} \cdot {(6 x)}^{3 - 3} \cdot {(2 y)}^{3}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(6 x)}^{3} \cdot {(2 y)}^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Step 4

Simplify each term.

Multiply ${(6 x)}^{3}$ by $1$ .

${(6 x)}^{3} \cdot {(2 y)}^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Apply the product rule to $6 x$ .

$6^{3} x^{3} \cdot {(2 y)}^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Raise $6$ to the power of $3$ .

$216 x^{3} \cdot {(2 y)}^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Apply the product rule to $2 y$ .

$216 x^{3} \cdot (2^{0} y^{0}) + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Rewrite using the commutative property of multiplication.

$216 \cdot 2^{0} x^{3} y^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Anything raised to $0$ is $1$ .

$216 \cdot 1 x^{3} y^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $216$ by $1$ .

$216 x^{3} y^{0} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Anything raised to $0$ is $1$ .

$216 x^{3} \cdot 1 + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $216$ by $1$ .

$216 x^{3} + 3 \cdot {(6 x)}^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Apply the product rule to $6 x$ .

$216 x^{3} + 3 \cdot (6^{2} x^{2}) \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Raise $6$ to the power of $2$ .

$216 x^{3} + 3 \cdot (36 x^{2}) \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $36$ by $3$ .

$216 x^{3} + 108 x^{2} \cdot {(2 y)}^{1} + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Simplify.

$216 x^{3} + 108 x^{2} \cdot (2 y) + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Rewrite using the commutative property of multiplication.

$216 x^{3} + 108 \cdot 2 x^{2} y + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $108$ by $2$ .

$216 x^{3} + 216 x^{2} y + 3 \cdot {(6 x)}^{1} \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Simplify.

$216 x^{3} + 216 x^{2} y + 3 \cdot (6 x) \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $6$ by $3$ .

$216 x^{3} + 216 x^{2} y + 18 x \cdot {(2 y)}^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Apply the product rule to $2 y$ .

$216 x^{3} + 216 x^{2} y + 18 x \cdot (2^{2} y^{2}) + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Rewrite using the commutative property of multiplication.

$216 x^{3} + 216 x^{2} y + 18 \cdot 2^{2} x y^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

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

$216 x^{3} + 216 x^{2} y + 18 \cdot 4 x y^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply $18$ by $4$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 1 \cdot {(6 x)}^{0} \cdot {(2 y)}^{3}$

Multiply ${(6 x)}^{0}$ by $1$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + {(6 x)}^{0} \cdot {(2 y)}^{3}$

Apply the product rule to $6 x$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 6^{0} x^{0} \cdot {(2 y)}^{3}$

Anything raised to $0$ is $1$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 1 x^{0} \cdot {(2 y)}^{3}$

Multiply $x^{0}$ by $1$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + x^{0} \cdot {(2 y)}^{3}$

Anything raised to $0$ is $1$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 1 \cdot {(2 y)}^{3}$

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

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + {(2 y)}^{3}$

Apply the product rule to $2 y$ .

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 2^{3} y^{3}$

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

$216 x^{3} + 216 x^{2} y + 72 x y^{2} + 8 y^{3}$

Expand Using the Binomial Theorem (6x+2y)^3

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