Pre-Algebra Examples

$6 \sqrt{98 x^{5}} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1

Simplify each term.

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Step 1.1

Rewrite $98 x^{5}$ as ${(7 x^{2})}^{2} \cdot (2 x)$ .

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Step 1.1.1

Factor $49$ out of $98$ .

$6 \sqrt{49 (2) x^{5}} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.2

Rewrite $49$ as $7^{2}$ .

$6 \sqrt{7^{2} \cdot 2 x^{5}} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.3

Factor out $x^{4}$ .

$6 \sqrt{7^{2} \cdot 2 (x^{4} x)} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.4

Rewrite $x^{4}$ as ${(x^{2})}^{2}$ .

$6 \sqrt{7^{2} \cdot 2 ({(x^{2})}^{2} x)} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.5

Move $2$ .

$6 \sqrt{7^{2} {(x^{2})}^{2} \cdot 2 x} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.6

Rewrite $7^{2} {(x^{2})}^{2}$ as ${(7 x^{2})}^{2}$ .

$6 \sqrt{{(7 x^{2})}^{2} \cdot 2 x} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.1.7

Add parentheses.

$6 \sqrt{{(7 x^{2})}^{2} \cdot (2 x)} - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.2

Pull terms out from under the radical.

$6 (7 x^{2} \sqrt{2 x}) - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.3

Multiply $7$ by $6$ .

$42 (x^{2} \sqrt{2 x}) - 2 x \sqrt{18 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4

Rewrite $18 x^{3}$ as ${(3 x)}^{2} \cdot (2 x)$ .

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Step 1.4.1

Factor $9$ out of $18$ .

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{9 (2) x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4.2

Rewrite $9$ as $3^{2}$ .

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{3^{2} \cdot 2 x^{3}} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4.3

Factor out $x^{2}$ .

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{3^{2} \cdot 2 (x^{2} x)} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4.4

Move $2$ .

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{3^{2} x^{2} \cdot 2 x} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4.5

Rewrite $3^{2} x^{2}$ as ${(3 x)}^{2}$ .

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{{(3 x)}^{2} \cdot 2 x} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.4.6

Add parentheses.

$42 x^{2} \sqrt{2 x} - 2 x \sqrt{{(3 x)}^{2} \cdot (2 x)} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.5

Pull terms out from under the radical.

$42 x^{2} \sqrt{2 x} - 2 x (3 x \sqrt{2 x}) - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.6

Multiply $x$ by $x$ by adding the exponents.

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Step 1.6.1

Move $x$ .

$42 x^{2} \sqrt{2 x} - 2 (x \cdot x) (3 \sqrt{2 x}) - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.6.2

Multiply $x$ by $x$ .

$42 x^{2} \sqrt{2 x} - 2 x^{2} (3 \sqrt{2 x}) - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.7

Multiply $3$ by $- 2$ .

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - \sqrt{2 x^{2}} + \sqrt{18 x^{2}}$

Step 1.8

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

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - \sqrt{x^{2} \cdot 2} + \sqrt{18 x^{2}}$

Step 1.9

Pull terms out from under the radical.

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - (x \sqrt{2}) + \sqrt{18 x^{2}}$

Step 1.10

Rewrite $18 x^{2}$ as ${(3 x)}^{2} \cdot 2$ .

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Step 1.10.1

Factor $9$ out of $18$ .

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - x \sqrt{2} + \sqrt{9 (2) x^{2}}$

Step 1.10.2

Rewrite $9$ as $3^{2}$ .

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - x \sqrt{2} + \sqrt{3^{2} \cdot 2 x^{2}}$

Step 1.10.3

Move $2$ .

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - x \sqrt{2} + \sqrt{3^{2} x^{2} \cdot 2}$

Step 1.10.4

Rewrite $3^{2} x^{2}$ as ${(3 x)}^{2}$ .

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - x \sqrt{2} + \sqrt{{(3 x)}^{2} \cdot 2}$

Step 1.11

Pull terms out from under the radical.

$42 x^{2} \sqrt{2 x} - 6 x^{2} \sqrt{2 x} - x \sqrt{2} + 3 x \sqrt{2}$

Step 2

Simplify by adding terms.

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Step 2.1

Subtract $6 x^{2} \sqrt{2 x}$ from $42 x^{2} \sqrt{2 x}$ .

$36 x^{2} \sqrt{2 x} - x \sqrt{2} + 3 x \sqrt{2}$

Step 2.2

Add $- x \sqrt{2}$ and $3 x \sqrt{2}$ .

$36 x^{2} \sqrt{2 x} + 2 x \sqrt{2}$