Question

Factor 5a^4 – 5a completely.

A. 5a(a – 1)(a^2 + a + 1)

B. 5a(a^3)

C. 5a(a + 1)(a^2 – a + 1)

D. 5a(a – 1)(a + 1)

Answer 1

take 5a out..

Answer 2

5a(a^3) ?

Answer 3

5a(a^3-1)

Answer 4

But that is not in the answer choices!

Answer 5

now use..\[a ^{3}-b ^{3}=(a-b)(a ^{2}+ab+b ^{2)}\]

Answer 6

sorry I don't understand:(

Answer 7

(a^3-1)=(a-1)(a^2+ab+b^2)

Answer 8

so its A