Question

factor:

5a^2(2a-7) - (2a-7)

Answer 1

http://www.wolframalpha.com/input/?i=5a%5E2%282a-7%29+-+%282a-7%29

Answer 2

my book says the answer is (5a^3-1)(2a-7)

Answer 3

it should be (5a^2 - 1)(2a - 7)

so there's a typo somewhere

Answer 4

the idea is to factor out the GCF 2a-7, that will give you the answer

Answer 5

where did you get the -1?

Answer 6

5a^2(2a-7) - (2a-7)

is the same as

5a^2(2a-7) - 1(2a-7)

Answer 7

so that's where the -1 comes from

Answer 8

@jim_thompson5910

Answer 9

does that make sense?

Answer 10

yes

Answer 11

ok great