Evaluate square root of x-8+ square root of x=4

$\sqrt{x - 8} + \sqrt{x} = 4$

Subtract $\sqrt{x}$ from both sides of the equation.

$\sqrt{x - 8} = 4 - \sqrt{x}$

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

${\sqrt{x - 8}}^{2} = {(4 - \sqrt{x})}^{2}$

Simplify each side of the equation.

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{x - 8}$ as ${(x - 8)}^{\frac{1}{2}}$ .

${({(x - 8)}^{\frac{1}{2}})}^{2} = {(4 - \sqrt{x})}^{2}$

Simplify the left side.

Simplify ${({(x - 8)}^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${({(x - 8)}^{\frac{1}{2}})}^{2}$ .

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

${(x - 8)}^{\frac{1}{2} \cdot 2} = {(4 - \sqrt{x})}^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(x - 8)}^{\frac{1}{2} \cdot 2} = {(4 - \sqrt{x})}^{2}$

Rewrite the expression.

${(x - 8)}^{1} = {(4 - \sqrt{x})}^{2}$

Simplify.

$x - 8 = {(4 - \sqrt{x})}^{2}$

Simplify the right side.

Simplify ${(4 - \sqrt{x})}^{2}$ .

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

$x - 8 = (4 - \sqrt{x}) (4 - \sqrt{x})$

Expand $(4 - \sqrt{x}) (4 - \sqrt{x})$ using the FOIL Method.

Apply the distributive property.

$x - 8 = 4 (4 - \sqrt{x}) - \sqrt{x} (4 - \sqrt{x})$

Apply the distributive property.

$x - 8 = 4 \cdot 4 + 4 (- \sqrt{x}) - \sqrt{x} (4 - \sqrt{x})$

Apply the distributive property.

$x - 8 = 4 \cdot 4 + 4 (- \sqrt{x}) - \sqrt{x} \cdot 4 - \sqrt{x} (- \sqrt{x})$

Simplify and combine like terms.

Simplify each term.

Multiply $4$ by $4$ .

$x - 8 = 16 + 4 (- \sqrt{x}) - \sqrt{x} \cdot 4 - \sqrt{x} (- \sqrt{x})$

Multiply $- 1$ by $4$ .

$x - 8 = 16 - 4 \sqrt{x} - \sqrt{x} \cdot 4 - \sqrt{x} (- \sqrt{x})$

Multiply $4$ by $- 1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} - \sqrt{x} (- \sqrt{x})$

Multiply $- \sqrt{x} (- \sqrt{x})$ .

Multiply $- 1$ by $- 1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + 1 \sqrt{x} \sqrt{x}$

Multiply $\sqrt{x}$ by $1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + \sqrt{x} \sqrt{x}$

Raise $\sqrt{x}$ to the power of $1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + {\sqrt{x}}^{1} \sqrt{x}$

Raise $\sqrt{x}$ to the power of $1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + {\sqrt{x}}^{1} {\sqrt{x}}^{1}$

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

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + {\sqrt{x}}^{1 + 1}$

Add $1$ and $1$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + {\sqrt{x}}^{2}$

Rewrite ${\sqrt{x}}^{2}$ as $x$ .

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

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + {(x^{\frac{1}{2}})}^{2}$

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

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + x^{\frac{1}{2} \cdot 2}$

Combine $\frac{1}{2}$ and $2$ .

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + x^{\frac{2}{2}}$

Cancel the common factor of $2$ .

Cancel the common factor.

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + x^{\frac{2}{2}}$

Rewrite the expression.

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + x^{1}$

Simplify.

$x - 8 = 16 - 4 \sqrt{x} - 4 \sqrt{x} + x$

Subtract $4 \sqrt{x}$ from $- 4 \sqrt{x}$ .

$x - 8 = 16 - 8 \sqrt{x} + x$

Solve for $- 8 \sqrt{x}$ .

Rewrite the equation as $16 - 8 \sqrt{x} + x = x - 8$ .

$16 - 8 \sqrt{x} + x = x - 8$

Move all terms not containing $- 8 \sqrt{x}$ to the right side of the equation.

Subtract $16$ from both sides of the equation.

$- 8 \sqrt{x} + x = x - 8 - 16$

Subtract $x$ from both sides of the equation.

$- 8 \sqrt{x} = x - 8 - 16 - x$

Combine the opposite terms in $x - 8 - 16 - x$ .

Subtract $x$ from $x$ .

$- 8 \sqrt{x} = 0 - 8 - 16$

Subtract $8$ from $0$ .

$- 8 \sqrt{x} = - 8 - 16$

Subtract $16$ from $- 8$ .

$- 8 \sqrt{x} = - 24$

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

${(- 8 \sqrt{x})}^{2} = {(- 24)}^{2}$

Simplify each side of the equation.

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

${(- 8 x^{\frac{1}{2}})}^{2} = {(- 24)}^{2}$

Simplify the left side.

Simplify ${(- 8 x^{\frac{1}{2}})}^{2}$ .

Apply the product rule to $- 8 x^{\frac{1}{2}}$ .

${(- 8)}^{2} {(x^{\frac{1}{2}})}^{2} = {(- 24)}^{2}$

Raise $- 8$ to the power of $2$ .

$64 {(x^{\frac{1}{2}})}^{2} = {(- 24)}^{2}$

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

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

$64 x^{\frac{1}{2} \cdot 2} = {(- 24)}^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

$64 x^{\frac{1}{2} \cdot 2} = {(- 24)}^{2}$

Rewrite the expression.

$64 x^{1} = {(- 24)}^{2}$

Simplify.

$64 x = {(- 24)}^{2}$

Simplify the right side.

Raise $- 24$ to the power of $2$ .

$64 x = 576$

Divide each term in $64 x = 576$ by $64$ and simplify.

Divide each term in $64 x = 576$ by $64$ .

$\frac{64 x}{64} = \frac{576}{64}$

Simplify the left side.

Cancel the common factor of $64$ .

Cancel the common factor.

$\frac{64 x}{64} = \frac{576}{64}$

Divide $x$ by $1$ .

$x = \frac{576}{64}$

Simplify the right side.

Divide $576$ by $64$ .

$x = 9$

Evaluate square root of x-8+ square root of x=4

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