SOLUTION: HI IN FOIL and Other POlynomails can u plz help me step how to GET 45r^2-120rs+80s^2 and 72-32y^2

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Question 306960: HI IN FOIL and Other POlynomails can u plz help me step how to GET 45r^2-120rs+80s^2 and 72-32y^2
Answer by mananth(12270) About Me  (Show Source):
You can put this solution on YOUR website!
45r^2-120rs+80s^2 and 72-32y^2
5(9r^2-24rs+16s^2)
a=3r, b=4s, 2ab= 2*3r*4s=24rs
use the formula a^2+2ab+b^2
5(3r+4s)^2
..
..
72-32y^2
2(36-16y^2)
2{(6)^2-(4y)^2}
2(6-4y)(6+4y)
8(3-2y)(3+2y)