Question

Which equations are true?

Choose all answers that apply:

A. x - (-x) = -x

B. 0 - (-x) = -x

C. None of the above

Answer 1

C. none of the above

Explanation:

A. x - (- x) is the equivalent of x + x, because subtracting a negative number is the same as adding it's positive counterpart. Therefore, it will be 2x, not -x.

B. Same thing. But this time, 0 - (- x) is the same as 0 + x, which is x, not -x.

Because neither are right, the only answer is C.