Simplify 3(r-s)*5(r-s)^3

$3 (r - s) \cdot 5 {(r - s)}^{3}$

Step 1

Multiply $r - s$ by ${(r - s)}^{3}$ by adding the exponents.

Move ${(r - s)}^{3}$ .

$3 ({(r - s)}^{3} (r - s)) \cdot 5$

Multiply ${(r - s)}^{3}$ by $r - s$ .

Raise $r - s$ to the power of $1$ .

$3 ({(r - s)}^{3} {(r - s)}^{1}) \cdot 5$

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

$3 {(r - s)}^{3 + 1} \cdot 5$

Add $3$ and $1$ .

$3 {(r - s)}^{4} \cdot 5$

Step 2

Use the Binomial Theorem.

$3 (r^{4} + 4 r^{3} (- s) + 6 r^{2} {(- s)}^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Step 3

Simplify terms.

Simplify each term.

Rewrite using the commutative property of multiplication.

$3 (r^{4} + 4 \cdot - 1 r^{3} s + 6 r^{2} {(- s)}^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Multiply $4$ by $- 1$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} {(- s)}^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Apply the product rule to $- s$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} ({(- 1)}^{2} s^{2}) + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Rewrite using the commutative property of multiplication.

$3 (r^{4} - 4 r^{3} s + 6 \cdot {(- 1)}^{2} r^{2} s^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

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

$3 (r^{4} - 4 r^{3} s + 6 \cdot 1 r^{2} s^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Multiply $6$ by $1$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} + 4 r {(- s)}^{3} + {(- s)}^{4}) \cdot 5$

Apply the product rule to $- s$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} + 4 r ({(- 1)}^{3} s^{3}) + {(- s)}^{4}) \cdot 5$

Rewrite using the commutative property of multiplication.

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} + 4 \cdot {(- 1)}^{3} r s^{3} + {(- s)}^{4}) \cdot 5$

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

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} + 4 \cdot - 1 r s^{3} + {(- s)}^{4}) \cdot 5$

Multiply $4$ by $- 1$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} - 4 r s^{3} + {(- s)}^{4}) \cdot 5$

Apply the product rule to $- s$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} - 4 r s^{3} + {(- 1)}^{4} s^{4}) \cdot 5$

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

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} - 4 r s^{3} + 1 s^{4}) \cdot 5$

Multiply $s^{4}$ by $1$ .

$3 (r^{4} - 4 r^{3} s + 6 r^{2} s^{2} - 4 r s^{3} + s^{4}) \cdot 5$

Apply the distributive property.

$(3 r^{4} + 3 (- 4 r^{3} s) + 3 (6 r^{2} s^{2}) + 3 (- 4 r s^{3}) + 3 s^{4}) \cdot 5$

Step 4

Simplify.

Multiply $- 4$ by $3$ .

$(3 r^{4} - 12 (r^{3} s) + 3 (6 r^{2} s^{2}) + 3 (- 4 r s^{3}) + 3 s^{4}) \cdot 5$

Multiply $6$ by $3$ .

$(3 r^{4} - 12 (r^{3} s) + 18 (r^{2} s^{2}) + 3 (- 4 r s^{3}) + 3 s^{4}) \cdot 5$

Multiply $- 4$ by $3$ .

$(3 r^{4} - 12 (r^{3} s) + 18 (r^{2} s^{2}) - 12 (r s^{3}) + 3 s^{4}) \cdot 5$

Step 5

Remove parentheses.

$(3 r^{4} - 12 r^{3} s + 18 r^{2} s^{2} - 12 r s^{3} + 3 s^{4}) \cdot 5$

Step 6

Apply the distributive property.

$3 r^{4} \cdot 5 - 12 r^{3} s \cdot 5 + 18 r^{2} s^{2} \cdot 5 - 12 r s^{3} \cdot 5 + 3 s^{4} \cdot 5$

Step 7

Simplify.

Multiply $5$ by $3$ .

$15 r^{4} - 12 r^{3} s \cdot 5 + 18 r^{2} s^{2} \cdot 5 - 12 r s^{3} \cdot 5 + 3 s^{4} \cdot 5$

Multiply $5$ by $- 12$ .

$15 r^{4} - 60 r^{3} s + 18 r^{2} s^{2} \cdot 5 - 12 r s^{3} \cdot 5 + 3 s^{4} \cdot 5$

Multiply $5$ by $18$ .

$15 r^{4} - 60 r^{3} s + 90 r^{2} s^{2} - 12 r s^{3} \cdot 5 + 3 s^{4} \cdot 5$

Multiply $5$ by $- 12$ .

$15 r^{4} - 60 r^{3} s + 90 r^{2} s^{2} - 60 r s^{3} + 3 s^{4} \cdot 5$

Multiply $5$ by $3$ .

$15 r^{4} - 60 r^{3} s + 90 r^{2} s^{2} - 60 r s^{3} + 15 s^{4}$

Simplify 3(r-s)*5(r-s)^3

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