Expand Using the Binomial Theorem (3x-y)^5

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

Step 1

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

$\sum_{k = 0}^{5} \frac{5!}{(5 - k)! k!} \cdot {(3 x)}^{5 - k} \cdot {(- y)}^{k}$

Step 2

Expand the summation.

$\frac{5!}{(5 - 0)! 0!} \cdot {(3 x)}^{5 - 0} \cdot {(- y)}^{0} + \frac{5!}{(5 - 1)! 1!} \cdot {(3 x)}^{5 - 1} \cdot {(- y)}^{1} + \dots + \frac{5!}{(5 - 5)! 5!} \cdot {(3 x)}^{5 - 5} \cdot {(- y)}^{5}$

Step 3

Simplify the exponents for each term of the expansion.

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

Step 4

Simplify the polynomial result.

$243 x^{5} - 405 x^{4} y + 270 x^{3} y^{2} - 90 x^{2} y^{3} + 15 x y^{4} - y^{5}$

Expand Using the Binomial Theorem (3x-y)^5

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