Question

Factor
4a^4+12a^3-20a^2

Answer 1

You can first of all cancel out a 4:
(12a^3 - 20a^2)/(16a^2+8a) = (3a^3 - 5a^2)/(4a^2 + 2a)
Then you can cancle out an a:
= (3a^2 - 5a)/(4a + 2)