# How do you solve the quadratic z^2+1=0 using any method?

Aug 14, 2016

$\pm i$

#### Explanation:

Simplest way is to add $- 1$ to both sides:

${z}^{2} = - 1$

Take square roots:

$z = \pm \sqrt{- 1} = \pm \sqrt{{i}^{2}} = \pm i$