Expand Using the Binomial Theorem (z-3)^7

${(z - 3)}^{7}$

Step 1

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

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

Step 2

Expand the summation.

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

Step 3

Simplify the exponents for each term of the expansion.

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

Step 4

Simplify the polynomial result.

$z^{7} - 21 z^{6} + 189 z^{5} - 945 z^{4} + 2835 z^{3} - 5103 z^{2} + 5103 z - 2187$

Expand Using the Binomial Theorem (z-3)^7

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