Pre-Algebra Examples

${(x + 1)}^{8}$

Step 1

Use the Binomial Theorem.

$x^{8} + 8 x^{7} \cdot 1 + 28 x^{6} \cdot 1^{2} + 56 x^{5} \cdot 1^{3} + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2

Simplify each term.

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Step 2.1

Multiply $8$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} \cdot 1^{2} + 56 x^{5} \cdot 1^{3} + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.2

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} \cdot 1 + 56 x^{5} \cdot 1^{3} + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.3

Multiply $28$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} \cdot 1^{3} + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.4

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} \cdot 1 + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.5

Multiply $56$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} \cdot 1^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.6

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} \cdot 1 + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.7

Multiply $70$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} \cdot 1^{5} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.8

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} \cdot 1 + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.9

Multiply $56$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} \cdot 1^{6} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.10

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} \cdot 1 + 8 x \cdot 1^{7} + 1^{8}$

Step 2.11

Multiply $28$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} + 8 x \cdot 1^{7} + 1^{8}$

Step 2.12

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} + 8 x \cdot 1 + 1^{8}$

Step 2.13

Multiply $8$ by $1$ .

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} + 8 x + 1^{8}$

Step 2.14

One to any power is one.

$x^{8} + 8 x^{7} + 28 x^{6} + 56 x^{5} + 70 x^{4} + 56 x^{3} + 28 x^{2} + 8 x + 1$