Solve by Completing the Square 2x^2+24x-6=0

$2 x^{2} + 24 x - 6 = 0$

Step 1

Add $6$ to both sides of the equation.

$2 x^{2} + 24 x = 6$

Step 2

Divide each term in $2 x^{2} + 24 x = 6$ by $2$ and simplify.

Divide each term in $2 x^{2} + 24 x = 6$ by $2$ .

$\frac{2 x^{2}}{2} + \frac{24 x}{2} = \frac{6}{2}$

Simplify the left side.

Simplify each term.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 x^{2}}{2} + \frac{24 x}{2} = \frac{6}{2}$

Divide $x^{2}$ by $1$ .

$x^{2} + \frac{24 x}{2} = \frac{6}{2}$

Cancel the common factor of $24$ and $2$ .

Factor $2$ out of $24 x$ .

$x^{2} + \frac{2 (12 x)}{2} = \frac{6}{2}$

Cancel the common factors.

Factor $2$ out of $2$ .

$x^{2} + \frac{2 (12 x)}{2 (1)} = \frac{6}{2}$

Cancel the common factor.

$x^{2} + \frac{2 (12 x)}{2 \cdot 1} = \frac{6}{2}$

Rewrite the expression.

$x^{2} + \frac{12 x}{1} = \frac{6}{2}$

Divide $12 x$ by $1$ .

$x^{2} + 12 x = \frac{6}{2}$

Simplify the right side.

Divide $6$ by $2$ .

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

Step 3

To create a trinomial square on the left side of the equation, find a value that is equal to the square of half of $b$ .

${(\frac{b}{2})}^{2} = {(6)}^{2}$

Step 4

Add the term to each side of the equation.

$x^{2} + 12 x + {(6)}^{2} = 3 + {(6)}^{2}$

Step 5

Simplify the equation.

Simplify the left side.

Raise $6$ to the power of $2$ .

$x^{2} + 12 x + 36 = 3 + {(6)}^{2}$

Simplify the right side.

Simplify $3 + {(6)}^{2}$ .

Raise $6$ to the power of $2$ .

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

Add $3$ and $36$ .

$x^{2} + 12 x + 36 = 39$

Step 6

Factor the perfect trinomial square into ${(x + 6)}^{2}$ .

${(x + 6)}^{2} = 39$

Step 7

Solve the equation for $x$ .

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$x + 6 = \pm \sqrt{39}$

Subtract $6$ from both sides of the equation.

$x = \pm \sqrt{39} - 6$

Step 8

The result can be shown in multiple forms.

Exact Form:

$x = \pm \sqrt{39} - 6$

Decimal Form:

$x = 0.24499799 \dots, - 12.24499799 \dots$

Solve by Completing the Square 2x^2+24x-6=0

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