18a2-33a-30 factor the trinomial

Answer 1

first find out if they all have a gcf and they do which is 3 (not 6 because it doesn't go into 33) so factor out 3

3(6a2-11a-10)

now find factors of -60 that come up with -11

1x-60

-1x60

2x-30

-2x30

3x-20

-3x20

4x-15

-4x15

5x-12

-5x12

6x-10

-6x10

if u take a good look at that really long list u see 4x-15 go because -15+4=-11 so you do 3(a-15)(a+4)

check your work by foiling it back together