math
posted by Susan .
Factor completley
12r^2 +36rf +27f^2
5x^520x^4+30x^3
Can anyone please help me with these two problems. I have to get them done and do not understand them. Please help me.

12r^2 +36rf +27f^2
= 3(4r^2 + 12rf + 9f^2)
= 3(2r+3f)(2r+3f) or 3(2r+3f)^2
5x^520x^4+30x^3
= 5x^3(x^2  4x + 6)