Solve by Factoring square root of 3x+11=x+5

$\sqrt{3 x} + 11 = x + 5$

Step 1

Move all the expressions to the left side of the equation.

Subtract $x$ from both sides of the equation.

$\sqrt{3 x} + 11 - x = 5$

Subtract $5$ from both sides of the equation.

$\sqrt{3 x} + 11 - x - 5 = 0$

Step 2

Subtract $5$ from $11$ .

$\sqrt{3 x} - x + 6 = 0$

Step 3

Move all terms not containing $\sqrt{3 x}$ to the right side of the equation.

Add $x$ to both sides of the equation.

$\sqrt{3 x} + 6 = x$

Subtract $6$ from both sides of the equation.

$\sqrt{3 x} = x - 6$

Step 4

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

${\sqrt{3 x}}^{2} = {(x - 6)}^{2}$

Step 5

Simplify each side of the equation.

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{3 x}$ as ${(3 x)}^{\frac{1}{2}}$ .

${({(3 x)}^{\frac{1}{2}})}^{2} = {(x - 6)}^{2}$

Simplify the left side.

Simplify ${({(3 x)}^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${({(3 x)}^{\frac{1}{2}})}^{2}$ .

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

${(3 x)}^{\frac{1}{2} \cdot 2} = {(x - 6)}^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(3 x)}^{\frac{1}{2} \cdot 2} = {(x - 6)}^{2}$

Rewrite the expression.

${(3 x)}^{1} = {(x - 6)}^{2}$

Simplify.

$3 x = {(x - 6)}^{2}$

Simplify the right side.

Simplify ${(x - 6)}^{2}$ .

Rewrite ${(x - 6)}^{2}$ as $(x - 6) (x - 6)$ .

$3 x = (x - 6) (x - 6)$

Expand $(x - 6) (x - 6)$ using the FOIL Method.

Apply the distributive property.

$3 x = x (x - 6) - 6 (x - 6)$

Apply the distributive property.

$3 x = x \cdot x + x \cdot - 6 - 6 (x - 6)$

Apply the distributive property.

$3 x = x \cdot x + x \cdot - 6 - 6 x - 6 \cdot - 6$

Simplify and combine like terms.

Simplify each term.

Multiply $x$ by $x$ .

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

Move $- 6$ to the left of $x$ .

$3 x = x^{2} - 6 \cdot x - 6 x - 6 \cdot - 6$

Multiply $- 6$ by $- 6$ .

$3 x = x^{2} - 6 x - 6 x + 36$

Subtract $6 x$ from $- 6 x$ .

$3 x = x^{2} - 12 x + 36$

Step 6

Solve for $x$ .

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

$x^{2} - 12 x + 36 = 3 x$

Move all terms containing $x$ to the left side of the equation.

Subtract $3 x$ from both sides of the equation.

$x^{2} - 12 x + 36 - 3 x = 0$

Subtract $3 x$ from $- 12 x$ .

$x^{2} - 15 x + 36 = 0$

Factor $x^{2} - 15 x + 36$ using the AC method.

Consider the form $x^{2} + b x + c$ . Find a pair of integers whose product is $c$ and whose sum is $b$ . In this case, whose product is $36$ and whose sum is $- 15$ .

$- 12, - 3$

Write the factored form using these integers.

$(x - 12) (x - 3) = 0$

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

$x - 12 = 0$

$x - 3 = 0$

Set $x - 12$ equal to $0$ and solve for $x$ .

Set $x - 12$ equal to $0$ .

$x - 12 = 0$

Add $12$ to both sides of the equation.

$x = 12$

Set $x - 3$ equal to $0$ and solve for $x$ .

Set $x - 3$ equal to $0$ .

$x - 3 = 0$

Add $3$ to both sides of the equation.

$x = 3$

The final solution is all the values that make $(x - 12) (x - 3) = 0$ true.

$x = 12, 3$

Step 7

Exclude the solutions that do not make $\sqrt{3 x} - x + 6 = 0$ true.

$x = 12$

Solve by Factoring square root of 3x+11=x+5

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