Precalculus Examples

$\sqrt{121 {(z - 2)}^{14}}$

Step 1

Rewrite $121 {(z - 2)}^{14}$ as ${(11 {(z - 2)}^{7})}^{2}$ .

$\sqrt{{(11 {(z - 2)}^{7})}^{2}}$

Step 2

Pull terms out from under the radical, assuming positive real numbers.

$11 {(z - 2)}^{7}$

Step 3

Use the Binomial Theorem.

$11 (z^{7} + 7 z^{6} \cdot - 2 + 21 z^{5} {(- 2)}^{2} + 35 z^{4} {(- 2)}^{3} + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4

Simplify terms.

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Step 4.1

Simplify each term.

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Step 4.1.1

Multiply $- 2$ by $7$ .

$11 (z^{7} - 14 z^{6} + 21 z^{5} {(- 2)}^{2} + 35 z^{4} {(- 2)}^{3} + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.2

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

$11 (z^{7} - 14 z^{6} + 21 z^{5} \cdot 4 + 35 z^{4} {(- 2)}^{3} + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.3

Multiply $4$ by $21$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} + 35 z^{4} {(- 2)}^{3} + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.4

Raise $- 2$ to the power of $3$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} + 35 z^{4} \cdot - 8 + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.5

Multiply $- 8$ by $35$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 35 z^{3} {(- 2)}^{4} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.6

Raise $- 2$ to the power of $4$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 35 z^{3} \cdot 16 + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.7

Multiply $16$ by $35$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} + 21 z^{2} {(- 2)}^{5} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.8

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

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} + 21 z^{2} \cdot - 32 + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.9

Multiply $- 32$ by $21$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} - 672 z^{2} + 7 z {(- 2)}^{6} + {(- 2)}^{7})$

Step 4.1.10

Raise $- 2$ to the power of $6$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} - 672 z^{2} + 7 z \cdot 64 + {(- 2)}^{7})$

Step 4.1.11

Multiply $64$ by $7$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} - 672 z^{2} + 448 z + {(- 2)}^{7})$

Step 4.1.12

Raise $- 2$ to the power of $7$ .

$11 (z^{7} - 14 z^{6} + 84 z^{5} - 280 z^{4} + 560 z^{3} - 672 z^{2} + 448 z - 128)$

Step 4.2

Apply the distributive property.

$11 z^{7} + 11 (- 14 z^{6}) + 11 (84 z^{5}) + 11 (- 280 z^{4}) + 11 (560 z^{3}) + 11 (- 672 z^{2}) + 11 (448 z) + 11 \cdot - 128$

Step 5

Simplify.

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Step 5.1

Multiply $- 14$ by $11$ .

$11 z^{7} - 154 z^{6} + 11 (84 z^{5}) + 11 (- 280 z^{4}) + 11 (560 z^{3}) + 11 (- 672 z^{2}) + 11 (448 z) + 11 \cdot - 128$

Step 5.2

Multiply $84$ by $11$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} + 11 (- 280 z^{4}) + 11 (560 z^{3}) + 11 (- 672 z^{2}) + 11 (448 z) + 11 \cdot - 128$

Step 5.3

Multiply $- 280$ by $11$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} - 3080 z^{4} + 11 (560 z^{3}) + 11 (- 672 z^{2}) + 11 (448 z) + 11 \cdot - 128$

Step 5.4

Multiply $560$ by $11$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} - 3080 z^{4} + 6160 z^{3} + 11 (- 672 z^{2}) + 11 (448 z) + 11 \cdot - 128$

Step 5.5

Multiply $- 672$ by $11$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} - 3080 z^{4} + 6160 z^{3} - 7392 z^{2} + 11 (448 z) + 11 \cdot - 128$

Step 5.6

Multiply $448$ by $11$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} - 3080 z^{4} + 6160 z^{3} - 7392 z^{2} + 4928 z + 11 \cdot - 128$

Step 5.7

Multiply $11$ by $- 128$ .

$11 z^{7} - 154 z^{6} + 924 z^{5} - 3080 z^{4} + 6160 z^{3} - 7392 z^{2} + 4928 z - 1408$