Find X in sqrt(1-(x^2))=i

Solve for x:
sqrt(1-x^2) = i

Raise both sides to the power of two:
1-x^2 = -1

Subtract 1 from both sides:
-x^2 = -2

Multiply both sides by -1:
x^2 = 2

Take the square root of both sides:
Answer: | x = sqrt(2)                  or x = -sqrt(2)

Nice answer guest  :)