Question

The sum of two polynomials is 8a2-7. If one polynomial is 3a-2b-1, what is the other polynomial?

Answer 1

8a²-7 - (3a-2b-1) = 
8a²-7 - 3a+2b+1 = 
8a² - 3a + 2b - 6   ←  the other polynomial