Precalculus Examples

${(x^{2} + 2)}^{\frac{5}{2}} + 2 x {(x^{2} + 2)}^{\frac{3}{2}} + x^{2} \sqrt{x^{2} + 2}$

Step 1

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x^{2} + 2}$ as ${(x^{2} + 2)}^{\frac{1}{2}}$ .

${(x^{2} + 2)}^{\frac{5}{2}} + 2 x {(x^{2} + 2)}^{\frac{3}{2}} + x^{2} {(x^{2} + 2)}^{\frac{1}{2}}$

Step 2

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of ${(x^{2} + 2)}^{\frac{5}{2}} + 2 x {(x^{2} + 2)}^{\frac{3}{2}} + x^{2} {(x^{2} + 2)}^{\frac{1}{2}}$ .

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Step 2.1

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of ${(x^{2} + 2)}^{\frac{5}{2}}$ .

${(x^{2} + 2)}^{\frac{1}{2}} {(x^{2} + 2)}^{\frac{4}{2}} + 2 x {(x^{2} + 2)}^{\frac{3}{2}} + x^{2} {(x^{2} + 2)}^{\frac{1}{2}}$

Step 2.2

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of $2 x {(x^{2} + 2)}^{\frac{3}{2}}$ .

${(x^{2} + 2)}^{\frac{1}{2}} {(x^{2} + 2)}^{\frac{4}{2}} + {(x^{2} + 2)}^{\frac{1}{2}} (2 x {(x^{2} + 2)}^{\frac{2}{2}}) + x^{2} {(x^{2} + 2)}^{\frac{1}{2}}$

Step 2.3

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of $x^{2} {(x^{2} + 2)}^{\frac{1}{2}}$ .

${(x^{2} + 2)}^{\frac{1}{2}} {(x^{2} + 2)}^{\frac{4}{2}} + {(x^{2} + 2)}^{\frac{1}{2}} (2 x {(x^{2} + 2)}^{\frac{2}{2}}) + {(x^{2} + 2)}^{\frac{1}{2}} x^{2}$

Step 2.4

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of ${(x^{2} + 2)}^{\frac{1}{2}} {(x^{2} + 2)}^{\frac{4}{2}} + {(x^{2} + 2)}^{\frac{1}{2}} (2 x {(x^{2} + 2)}^{\frac{2}{2}})$ .

${(x^{2} + 2)}^{\frac{1}{2}} ({(x^{2} + 2)}^{\frac{4}{2}} + 2 x {(x^{2} + 2)}^{\frac{2}{2}}) + {(x^{2} + 2)}^{\frac{1}{2}} x^{2}$

Step 2.5

Factor ${(x^{2} + 2)}^{\frac{1}{2}}$ out of ${(x^{2} + 2)}^{\frac{1}{2}} ({(x^{2} + 2)}^{\frac{4}{2}} + 2 x {(x^{2} + 2)}^{\frac{2}{2}}) + {(x^{2} + 2)}^{\frac{1}{2}} x^{2}$ .

${(x^{2} + 2)}^{\frac{1}{2}} ({(x^{2} + 2)}^{\frac{4}{2}} + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 3

Divide $4$ by $2$ .

${(x^{2} + 2)}^{\frac{1}{2}} ({(x^{2} + 2)}^{2} + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 4

Rewrite ${(x^{2} + 2)}^{2}$ as $(x^{2} + 2) (x^{2} + 2)$ .

${(x^{2} + 2)}^{\frac{1}{2}} ((x^{2} + 2) (x^{2} + 2) + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 5

Expand $(x^{2} + 2) (x^{2} + 2)$ using the FOIL Method.

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Step 5.1

Apply the distributive property.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{2} (x^{2} + 2) + 2 (x^{2} + 2) + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 5.2

Apply the distributive property.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{2} x^{2} + x^{2} \cdot 2 + 2 (x^{2} + 2) + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 5.3

Apply the distributive property.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{2} x^{2} + x^{2} \cdot 2 + 2 x^{2} + 2 \cdot 2 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 6

Simplify and combine like terms.

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Step 6.1

Simplify each term.

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Step 6.1.1

Multiply $x^{2}$ by $x^{2}$ by adding the exponents.

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Step 6.1.1.1

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{2 + 2} + x^{2} \cdot 2 + 2 x^{2} + 2 \cdot 2 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 6.1.1.2

Add $2$ and $2$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + x^{2} \cdot 2 + 2 x^{2} + 2 \cdot 2 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 6.1.2

Move $2$ to the left of $x^{2}$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 2 x^{2} + 2 x^{2} + 2 \cdot 2 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 6.1.3

Multiply $2$ by $2$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 2 x^{2} + 2 x^{2} + 4 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 6.2

Add $2 x^{2}$ and $2 x^{2}$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x {(x^{2} + 2)}^{\frac{2}{2}} + x^{2})$

Step 7

Divide $2$ by $2$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x {(x^{2} + 2)}^{1} + x^{2})$

Step 8

Simplify.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x (x^{2} + 2) + x^{2})$

Step 9

Apply the distributive property.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x \cdot x^{2} + 2 x \cdot 2 + x^{2})$

Step 10

Multiply $x$ by $x^{2}$ by adding the exponents.

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Step 10.1

Move $x^{2}$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 (x^{2} x) + 2 x \cdot 2 + x^{2})$

Step 10.2

Multiply $x^{2}$ by $x$ .

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Step 10.2.1

Raise $x$ to the power of $1$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 (x^{2} x^{1}) + 2 x \cdot 2 + x^{2})$

Step 10.2.2

Use the power rule $a^{m} a^{n} = a^{m + n}$ to combine exponents.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x^{2 + 1} + 2 x \cdot 2 + x^{2})$

Step 10.3

Add $2$ and $1$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x^{3} + 2 x \cdot 2 + x^{2})$

Step 11

Multiply $2$ by $2$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 4 x^{2} + 4 + 2 x^{3} + 4 x + x^{2})$

Step 12

Add $4 x^{2}$ and $x^{2}$ .

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 5 x^{2} + 4 + 2 x^{3} + 4 x)$

Step 13

Reorder terms.

${(x^{2} + 2)}^{\frac{1}{2}} (x^{4} + 2 x^{3} + 5 x^{2} + 4 x + 4)$