Calculus Examples

$x = 2 \sqrt{x}$

Step 1

Since the radical is on the right side of the equation, switch the sides so it is on the left side of the equation.

$2 \sqrt{x} = x$

Step 2

To remove the radical on the left side of the equation, square both sides of the equation.

${(2 \sqrt{x})}^{2} = x^{2}$

Step 3

Simplify each side of the equation.

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Step 3.1

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

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

Step 3.2

Simplify the left side.

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Step 3.2.1

Simplify ${(2 x^{\frac{1}{2}})}^{2}$ .

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Step 3.2.1.1

Apply the product rule to $2 x^{\frac{1}{2}}$ .

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

Step 3.2.1.2

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

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

Step 3.2.1.3

Multiply the exponents in ${(x^{\frac{1}{2}})}^{2}$ .

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Step 3.2.1.3.1

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$4 x^{\frac{1}{2} \cdot 2} = x^{2}$

Step 3.2.1.3.2

Cancel the common factor of $2$ .

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Step 3.2.1.3.2.1

Cancel the common factor.

$4 x^{\frac{1}{2} \cdot 2} = x^{2}$

Step 3.2.1.3.2.2

Rewrite the expression.

$4 x^{1} = x^{2}$

Step 3.2.1.4

Simplify.

$4 x = x^{2}$

Step 4

Solve for $x$ .

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Step 4.1

Subtract $x^{2}$ from both sides of the equation.

$4 x - x^{2} = 0$

Step 4.2

Factor the left side of the equation.

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Step 4.2.1

Let $u = x$ . Substitute $u$ for all occurrences of $x$ .

$4 u - u^{2} = 0$

Step 4.2.2

Factor $u$ out of $4 u - u^{2}$ .

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Step 4.2.2.1

Factor $u$ out of $4 u$ .

$u \cdot 4 - u^{2} = 0$

Step 4.2.2.2

Factor $u$ out of $- u^{2}$ .

$u \cdot 4 + u (- u) = 0$

Step 4.2.2.3

Factor $u$ out of $u \cdot 4 + u (- u)$ .

$u (4 - u) = 0$

Step 4.2.3

Replace all occurrences of $u$ with $x$ .

$x (4 - x) = 0$

Step 4.3

If any individual factor on the left side of the equation is equal to $0$ , the entire expression will be equal to $0$ .

$x = 0$

$4 - x = 0$

Step 4.4

Set $x$ equal to $0$ .

$x = 0$

Step 4.5

Set $4 - x$ equal to $0$ and solve for $x$ .

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Step 4.5.1

Set $4 - x$ equal to $0$ .

$4 - x = 0$

Step 4.5.2

Solve $4 - x = 0$ for $x$ .

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Step 4.5.2.1

Subtract $4$ from both sides of the equation.

$- x = - 4$

Step 4.5.2.2

Divide each term in $- x = - 4$ by $- 1$ and simplify.

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Step 4.5.2.2.1

Divide each term in $- x = - 4$ by $- 1$ .

$\frac{- x}{- 1} = \frac{- 4}{- 1}$

Step 4.5.2.2.2

Simplify the left side.

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Step 4.5.2.2.2.1

Dividing two negative values results in a positive value.

$\frac{x}{1} = \frac{- 4}{- 1}$

Step 4.5.2.2.2.2

Divide $x$ by $1$ .

$x = \frac{- 4}{- 1}$

Step 4.5.2.2.3

Simplify the right side.

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Step 4.5.2.2.3.1

Divide $- 4$ by $- 1$ .

$x = 4$

Step 4.6

The final solution is all the values that make $x (4 - x) = 0$ true.

$x = 0, 4$