Question

Write your answer in descending powers of a. (a 3 - 2a + 5) - (4a 3 - 5a 2 + a - 2)

Answer 1

a^3 - 4a^3= - 3a^3
-2a - a= - 3a

the answer is -3a^3+5a^2-3a+5+2=-3a^3+5a^2-3a+7