Question

Factor completely. Show all work. If polynomial is prime state this.

6x^2+21x+15

Answer 1

(2x + 5)(3x+3)

Answer 2

Can you show work on it, so I can understand it better?

Answer 3

its just factoring, using the factors of 6 and 15 when you try to foil them they have to equal the middle number of 21

Answer 4

oh ok, thank you! I knew it was easier than it looked.

Answer 5

I foiled it out and this is my work, is it right?

2x*3x =6x^2
5*3=15
(2x+5)(3x+3)
F=6x^2 O=5x I=15x L=15
6x^2+20x+15

How come the middle number is not 21? or is this right?

Answer 6

I got it, thank you, I did the O wrong, it should be 6x! Thanks.