Question

Solve for x:

x^2+120=0
A. -11, -11i
B. -11, 11i
C. 11, 11i
D. 11, -11i
None of the above

Answer 1

Explanation:

x^2+120=0 can be rewritten as x^2 = - 120. Taking the square root of both sides, we get x = plus or minus i*√120 = plus or minus i*√4√30, or

x = plus or minus i*2√30

So the correct answer choice here is "None of the above."