Question 430986
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Hi
Recommend for 1-3 to multiply the factors using FOIL to verify those factors
F	First terms
O	Outside terms
I	Inside terms
L	Last terms
(1) 9-x^2                  (3-x)(3+x)
(2) 4x^2-36x+81            (2x-9)(2x-9)
(3) 4(y^2+4y+4)            4(y+2)(y+2)


(4) {{{(x^2-25)/(x+5)= (x-5)cross(x+5)/cross(x+5) = highlight(x-5)}}}