Solve Using the Quadratic Formula x^2+13x+7=0

$x^{2} + 13 x + 7 = 0$

Step 1

Use the quadratic formula to find the solutions.

$\frac{- b \pm \sqrt{b^{2} - 4 (a c)}}{2 a}$

Step 2

Substitute the values $a = 1$ , $b = 13$ , and $c = 7$ into the quadratic formula and solve for $x$ .

$\frac{- 13 \pm \sqrt{13^{2} - 4 \cdot (1 \cdot 7)}}{2 \cdot 1}$

Step 3

Simplify.

Simplify the numerator.

Raise $13$ to the power of $2$ .

$x = \frac{- 13 \pm \sqrt{169 - 4 \cdot 1 \cdot 7}}{2 \cdot 1}$

Multiply $- 4 \cdot 1 \cdot 7$ .

Multiply $- 4$ by $1$ .

$x = \frac{- 13 \pm \sqrt{169 - 4 \cdot 7}}{2 \cdot 1}$

Multiply $- 4$ by $7$ .

$x = \frac{- 13 \pm \sqrt{169 - 28}}{2 \cdot 1}$

Subtract $28$ from $169$ .

$x = \frac{- 13 \pm \sqrt{141}}{2 \cdot 1}$

Multiply $2$ by $1$ .

$x = \frac{- 13 \pm \sqrt{141}}{2}$

Step 4

The result can be shown in multiple forms.

Exact Form:

$x = \frac{- 13 \pm \sqrt{141}}{2}$

Decimal Form:

$x = - 0.56282895 \dots, - 12.43717104 \dots$