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)            



 

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