Question

Subtract -7a^2 + 3a -9 from 5a^2 - 6a -4 Answer should be polynomial in standard form

Answer 1

5a^2 - 6a -4 - (-7a^2 + 3a -9)
=5a^2 - 6a -4 + 7a^2 -  3a + 9
=12a^2 - 9a + 5

answer
12a^2 - 9a + 5