Question

Complete the explanation of the error.

If x2=16, then x=4
The value of x could also be....

Answer 1

8 or -4

Explanation:

The error is they believed x2 meant x^2 OR they forgot that x could also equal to -4.

Answer 2

x^2 = 16 has two solutions. They are 4 and -4. So the value of x could also be -4.