Question

Find the roots of the function.

ƒ(x) = x^2 + 81

x = -81i, 81i
x = -81, 81
x = -9, 9
x = -9i, 9i

Answer 1

For quick answer its -9i,9i

Answer 2

the answer is -9i , 9i
x^2+81=0
x^2=-81
x=√-81
=9i,-9i