If x2 + 4 = 0, then x ?

A.
4 
B.
4 
C.
2 
D.
2 
E.
None of the above
Correct Answer: Option E
Explanation
x2 + 4 = 0
x2 = 4
You can’t apply a square root to a negative number. So the answer is None of the above.
If x2 + 4 = 0, then x ?
x2 + 4 = 0
x2 = 4
You can’t apply a square root to a negative number. So the answer is None of the above.