JAMB - Mathematics (1978 - No. 8)
If x\(^2\) + 4 = 0, then x ?
4
-4
2
-2
None of the above
Explication
x\(^2\) + 4 = 0
x\(^2\) = -4
You can't apply a square root to a negative number. So the answer is None of the above.
x\(^2\) = -4
You can't apply a square root to a negative number. So the answer is None of the above.