Solve Using the Quadratic Formula x^2+121=0

$x^{2} + 121 = 0$

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 $a = 1$ , $b = 0$ , and $c = 121$ into the quadratic formula and solve for $x$ .

$\frac{0 \pm \sqrt{0^{2} - 4 \cdot (1 \cdot 121)}}{2 \cdot 1}$

Step 3

Simplify.

Simplify the numerator.

Raising $0$ to any positive power yields $0$ .

$x = \frac{0 \pm \sqrt{0 - 4 \cdot 1 \cdot 121}}{2 \cdot 1}$

Multiply $- 4 \cdot 1 \cdot 121$ .

Multiply $- 4$ by $1$ .

$x = \frac{0 \pm \sqrt{0 - 4 \cdot 121}}{2 \cdot 1}$

Multiply $- 4$ by $121$ .

$x = \frac{0 \pm \sqrt{0 - 484}}{2 \cdot 1}$

Subtract $484$ from $0$ .

$x = \frac{0 \pm \sqrt{- 484}}{2 \cdot 1}$

Rewrite $- 484$ as $- 1 (484)$ .

$x = \frac{0 \pm \sqrt{- 1 \cdot 484}}{2 \cdot 1}$

Rewrite $\sqrt{- 1 (484)}$ as $\sqrt{- 1} \cdot \sqrt{484}$ .

$x = \frac{0 \pm \sqrt{- 1} \cdot \sqrt{484}}{2 \cdot 1}$

Rewrite $\sqrt{- 1}$ as $i$ .

$x = \frac{0 \pm i \cdot \sqrt{484}}{2 \cdot 1}$

Rewrite $484$ as $22^{2}$ .

$x = \frac{0 \pm i \cdot \sqrt{22^{2}}}{2 \cdot 1}$

Pull terms out from under the radical, assuming positive real numbers.

$x = \frac{0 \pm i \cdot 22}{2 \cdot 1}$

Move $22$ to the left of $i$ .

$x = \frac{0 \pm 22 i}{2 \cdot 1}$

Multiply $2$ by $1$ .

$x = \frac{0 \pm 22 i}{2}$

Simplify $\frac{0 \pm 22 i}{2}$ .

$x = \pm 11 i$