Question

John and Nadim do the math homework together. When they find 9 - (-8), they get different answers. John claims the difference is 17. Nadim claims the difference is -1. Who is correct?

Answer 1

John is correct

Explanation:

The rule in mathematics states that

- × + = -

+ × + = +

- × - = +

Hence, for the homework,

9 - (- 8) = x

9 + 8 = 17

Therefore, John is correct and Nadim is incorrect.