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

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Answer 1 · 2016-08-14T09:17:50

$+-i$

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

$z^2 = -1$

Take square roots:

$z = +-sqrt(-1) = +-sqrt(i^2) = +-i$

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