Question

Simplify (8x2 − 1 + 2x3) − (7x3 − 3x2 + 1). I don't understand what I'm doing wrong.

Answer 1

-5x3 + 11x2 - 2 i think this is it

Answer 2

Did you distribute the negative 1 across the second term?

8x^2-1+2x^3-7x^3+3x^2-1

The answer should be -5x^3 + 11x^2