Algebra Examples

{(x - 3)}^{2}

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

Step 1

Use the binomial expansion theorem to find each term. The binomial theorem states

{(a + b)}^{n} = n \sum k = 0 n C k \cdot (a^{n - k} b^{k})

${(a + b)}^{n} = \sum_{k = 0}^{n} n C k \cdot (a^{n - k} b^{k})$ .

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

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

Step 2

Expand the summation.

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

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

Step 3

Simplify the exponents for each term of the expansion.

1 \cdot {(x)}^{2} \cdot {(- 3)}^{0} + 2 \cdot {(x)}^{1} \cdot {(- 3)}^{1} + 1 \cdot {(x)}^{0} \cdot {(- 3)}^{2}

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

Step 4

Simplify each term.

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Step 4.1

Multiply

${(x)}^{2}$ by

$1$ .

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

Step 4.2

Anything raised to

$0$ is

$1$ .

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

Step 4.3

Multiply

$x^{2}$ by

$1$ .

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

Step 4.4

Simplify.

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

Step 4.5

Evaluate the exponent.

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

Step 4.6

Multiply

$- 3$ by

$2$ .

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

Step 4.7

Multiply

${(x)}^{0}$ by

$1$ .

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

Step 4.8

Anything raised to

$0$ is

$1$ .

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

Step 4.9

Multiply

${(- 3)}^{2}$ by

$1$ .

$x^{2} - 6 x + {(- 3)}^{2}$

Step 4.10

Raise

$- 3$ to the power of

$2$ .

$x^{2} - 6 x + 9$

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