Solve for x 3x = square root of 12x+5

$3 x = \sqrt{12 x + 5}$

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

$\sqrt{12 x + 5} = 3 x$

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

${\sqrt{12 x + 5}}^{2} = {(3 x)}^{2}$

Simplify each side of the equation.

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{12 x + 5}$ as ${(12 x + 5)}^{\frac{1}{2}}$ .

${({(12 x + 5)}^{\frac{1}{2}})}^{2} = {(3 x)}^{2}$

Simplify the left side.

Simplify ${({(12 x + 5)}^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${({(12 x + 5)}^{\frac{1}{2}})}^{2}$ .

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

${(12 x + 5)}^{\frac{1}{2} \cdot 2} = {(3 x)}^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(12 x + 5)}^{\frac{1}{2} \cdot 2} = {(3 x)}^{2}$

Rewrite the expression.

${(12 x + 5)}^{1} = {(3 x)}^{2}$

Simplify.

$12 x + 5 = {(3 x)}^{2}$

Simplify the right side.

Simplify ${(3 x)}^{2}$ .

Apply the product rule to $3 x$ .

$12 x + 5 = 3^{2} x^{2}$

Raise $3$ to the power of $2$ .

$12 x + 5 = 9 x^{2}$

Solve for $x$ .

Subtract $9 x^{2}$ from both sides of the equation.

$12 x + 5 - 9 x^{2} = 0$

Factor the left side of the equation.

Factor $- 1$ out of $12 x + 5 - 9 x^{2}$ .

Reorder the expression.

Move $5$ .

$12 x - 9 x^{2} + 5 = 0$

Reorder $12 x$ and $- 9 x^{2}$ .

$- 9 x^{2} + 12 x + 5 = 0$

Factor $- 1$ out of $- 9 x^{2}$ .

$- (9 x^{2}) + 12 x + 5 = 0$

Factor $- 1$ out of $12 x$ .

$- (9 x^{2}) - (- 12 x) + 5 = 0$

Rewrite $5$ as $- 1 (- 5)$ .

$- (9 x^{2}) - (- 12 x) - 1 \cdot - 5 = 0$

Factor $- 1$ out of $- (9 x^{2}) - (- 12 x)$ .

$- (9 x^{2} - 12 x) - 1 \cdot - 5 = 0$

Factor $- 1$ out of $- (9 x^{2} - 12 x) - 1 (- 5)$ .

$- (9 x^{2} - 12 x - 5) = 0$

Factor.

Factor by grouping.

For a polynomial of the form $a x^{2} + b x + c$ , rewrite the middle term as a sum of two terms whose product is $a \cdot c = 9 \cdot - 5 = - 45$ and whose sum is $b = - 12$ .

Factor $- 12$ out of $- 12 x$ .

$- (9 x^{2} - 12 x - 5) = 0$

Rewrite $- 12$ as $3$ plus $- 15$

$- (9 x^{2} + (3 - 15) x - 5) = 0$

Apply the distributive property.

$- (9 x^{2} + 3 x - 15 x - 5) = 0$

Factor out the greatest common factor from each group.

Group the first two terms and the last two terms.

$- ((9 x^{2} + 3 x) - 15 x - 5) = 0$

Factor out the greatest common factor (GCF) from each group.

$- (3 x (3 x + 1) - 5 (3 x + 1)) = 0$

Factor the polynomial by factoring out the greatest common factor, $3 x + 1$ .

$- ((3 x + 1) (3 x - 5)) = 0$

Remove unnecessary parentheses.

$- (3 x + 1) (3 x - 5) = 0$

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

$3 x + 1 = 0$

$3 x - 5 = 0$

Set $3 x + 1$ equal to $0$ and solve for $x$ .

Set $3 x + 1$ equal to $0$ .

$3 x + 1 = 0$

Solve $3 x + 1 = 0$ for $x$ .

Subtract $1$ from both sides of the equation.

$3 x = - 1$

Divide each term in $3 x = - 1$ by $3$ and simplify.

Divide each term in $3 x = - 1$ by $3$ .

$\frac{3 x}{3} = \frac{- 1}{3}$

Simplify the left side.

Cancel the common factor of $3$ .

Cancel the common factor.

$\frac{3 x}{3} = \frac{- 1}{3}$

Divide $x$ by $1$ .

$x = \frac{- 1}{3}$

Simplify the right side.

Move the negative in front of the fraction.

$x = - \frac{1}{3}$

Set $3 x - 5$ equal to $0$ and solve for $x$ .

Set $3 x - 5$ equal to $0$ .

$3 x - 5 = 0$

Solve $3 x - 5 = 0$ for $x$ .

Add $5$ to both sides of the equation.

$3 x = 5$

Divide each term in $3 x = 5$ by $3$ and simplify.

Divide each term in $3 x = 5$ by $3$ .

$\frac{3 x}{3} = \frac{5}{3}$

Simplify the left side.

Cancel the common factor of $3$ .

Cancel the common factor.

$\frac{3 x}{3} = \frac{5}{3}$

Divide $x$ by $1$ .

$x = \frac{5}{3}$

The final solution is all the values that make $- (3 x + 1) (3 x - 5) = 0$ true.

$x = - \frac{1}{3}, \frac{5}{3}$

Exclude the solutions that do not make $3 x = \sqrt{12 x + 5}$ true.

$x = \frac{5}{3}$

The result can be shown in multiple forms.

Exact Form:

$x = \frac{5}{3}$

Decimal Form:

$x = 1.\overline{6}$

Mixed Number Form:

$x = 1 \frac{2}{3}$

Solve for x 3x = square root of 12x+5

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