Resposta :

3478elc

 a) 2x-6xy= 2(x - 3y)

b)a(x+y)+b(x+y)= (a+b)(x+y)

c)ax+ay-bx-by= a(x+y)-b(x+y)= (a-b)(x+y)

d)x2-16= (x+4)(x-4)

e)x2+2xy+y2 = (x+y)(x+y)= (x+y)^2

f)x2-6x+9= (x-3)(x-3)=(x-3)^2

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