Expand Using the Binomial Theorem (x^4-y)^5

${(x^{4} - y)}^{5}$

Step 1

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

$\sum_{k = 0}^{5} \frac{5!}{(5 - k)! k!} \cdot {(x^{4})}^{5 - k} \cdot {(- y)}^{k}$

Step 2

Expand the summation.

$\frac{5!}{(5 - 0)! 0!} \cdot {(x^{4})}^{5 - 0} \cdot {(- y)}^{0} + \frac{5!}{(5 - 1)! 1!} \cdot {(x^{4})}^{5 - 1} \cdot {(- y)}^{1} + \dots + \frac{5!}{(5 - 5)! 5!} \cdot {(x^{4})}^{5 - 5} \cdot {(- y)}^{5}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(x^{4})}^{5} \cdot {(- y)}^{0} + 5 \cdot {(x^{4})}^{4} \cdot {(- y)}^{1} + \dots + 1 \cdot {(x^{4})}^{0} \cdot {(- y)}^{5}$

Step 4

Simplify the polynomial result.

$x^{20} - 5 x^{16} y + 10 x^{12} y^{2} - 10 x^{8} y^{3} + 5 x^{4} y^{4} - y^{5}$

Expand Using the Binomial Theorem (x^4-y)^5

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