Question

A student evoluated -4 + x for x = -9 and got an answer of 5. what might the student have done wrong

Answer 1

The student may have forgotten the negative signs.

Explanation:

Obviously, 4+5 = 9. However, this student may have forgotten that negative plus negative is equal to further negative, which is what we want. Instead, the answer 5 was provided, which leads to an incorrect sum of 1.