Expand Using the Binomial Theorem (3x-2)^7

${(3 x - 2)}^{7}$

Step 1

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

$\sum_{k = 0}^{7} \frac{7!}{(7 - k)! k!} \cdot {(3 x)}^{7 - k} \cdot {(- 2)}^{k}$

Step 2

Expand the summation.

$\frac{7!}{(7 - 0)! 0!} \cdot {(3 x)}^{7 - 0} \cdot {(- 2)}^{0} + \frac{7!}{(7 - 1)! 1!} \cdot {(3 x)}^{7 - 1} \cdot {(- 2)}^{1} + \dots + \frac{7!}{(7 - 7)! 7!} \cdot {(3 x)}^{7 - 7} \cdot {(- 2)}^{7}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(3 x)}^{7} \cdot {(- 2)}^{0} + 7 \cdot {(3 x)}^{6} \cdot {(- 2)}^{1} + \dots + 1 \cdot {(3 x)}^{0} \cdot {(- 2)}^{7}$

Step 4

Simplify the polynomial result.

$2187 x^{7} - 10206 x^{6} + 20412 x^{5} - 22680 x^{4} + 15120 x^{3} - 6048 x^{2} + 1344 x - 128$

Expand Using the Binomial Theorem (3x-2)^7

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