Expand Using the Binomial Theorem (z-5)^2

${(z - 5)}^{2}$

Step 1

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

$\sum_{k = 0}^{2} \frac{2!}{(2 - k)! k!} \cdot {(z)}^{2 - k} \cdot {(- 5)}^{k}$

Step 2

Expand the summation.

$\frac{2!}{(2 - 0)! 0!} {(z)}^{2 - 0} \cdot {(- 5)}^{0} + \frac{2!}{(2 - 1)! 1!} {(z)}^{2 - 1} \cdot {(- 5)}^{1} + \frac{2!}{(2 - 2)! 2!} {(z)}^{2 - 2} \cdot {(- 5)}^{2}$

Step 3

Simplify the exponents for each term of the expansion.

$1 \cdot {(z)}^{2} \cdot {(- 5)}^{0} + 2 \cdot {(z)}^{1} \cdot {(- 5)}^{1} + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Step 4

Simplify each term.

Multiply ${(z)}^{2}$ by $1$ .

${(z)}^{2} \cdot {(- 5)}^{0} + 2 \cdot {(z)}^{1} \cdot {(- 5)}^{1} + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Anything raised to $0$ is $1$ .

$z^{2} \cdot 1 + 2 \cdot {(z)}^{1} \cdot {(- 5)}^{1} + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Multiply $z^{2}$ by $1$ .

$z^{2} + 2 \cdot {(z)}^{1} \cdot {(- 5)}^{1} + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Simplify.

$z^{2} + 2 \cdot z \cdot {(- 5)}^{1} + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Evaluate the exponent.

$z^{2} + 2 z \cdot - 5 + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Multiply $- 5$ by $2$ .

$z^{2} - 10 z + 1 \cdot {(z)}^{0} \cdot {(- 5)}^{2}$

Multiply ${(z)}^{0}$ by $1$ .

$z^{2} - 10 z + {(z)}^{0} \cdot {(- 5)}^{2}$

Anything raised to $0$ is $1$ .

$z^{2} - 10 z + 1 \cdot {(- 5)}^{2}$

Multiply ${(- 5)}^{2}$ by $1$ .

$z^{2} - 10 z + {(- 5)}^{2}$

Raise $- 5$ to the power of $2$ .

$z^{2} - 10 z + 25$

Expand Using the Binomial Theorem (z-5)^2

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