Solve x^2=-80

$$x ^ { 2 } = - 80$$

Solve for x (complex solution)

$$x=-4\sqrt{5}i\approx -0-8.94427191i$$

$$x=4\sqrt{5}i\approx 8.94427191i$$

Steps by Finding Square Root

The equation is now solved.

$$x=4\sqrt{5}i x=-4\sqrt{5}i$$

Steps Using the Quadratic Formula

Add 80 to both sides.

$$x^{2}+80=0$$

This equation is in standard form: ax^{2}+bx+c=0. Substitute 1 for a, 0 for b, and 80 for c in the quadratic formula, \frac{-b±\sqrt{b^{2}-4ac}}{2a}.

$$x=\frac{0±\sqrt{0^{2}-4\times 80}}{2}$$

Square 0.

$$x=\frac{0±\sqrt{-4\times 80}}{2}$$

Multiply -4 times 80.

$$x=\frac{0±\sqrt{-320}}{2}$$

Take the square root of -320.

$$x=\frac{0±8\sqrt{5}i}{2}$$

Now solve the equation x=\frac{0±8\sqrt{5}i}{2} when ± is plus.

$$x=4\sqrt{5}i$$

Now solve the equation x=\frac{0±8\sqrt{5}i}{2} when ± is minus.

$$x=-4\sqrt{5}i$$

The equation is now solved.

$$x=4\sqrt{5}i x=-4\sqrt{5}i$$