Question: What integral values of x satisfy the equation x2 = 16?


A ) 4, - 4
B ) - 4
C ) 16
D ) 5, - 5

Steps to derive

 [Original equation.]
1 x2 = 16

 [Take square root on both sides.]
2 x = ± 16

 [42 = 16 and (- 4)2 = 16.]
3 x = ± 4

4 The values of x satisfying the equation are 4 and - 4.



Hence the right answer is Option A

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