Calcule o produto da soma pela diferença de dois termos

a) (x+y) . (x-y) =

b) (y-7) . (y+7)=

c) (x+3) . (x-3)=

d) (2x+5) . (2x-5)=

e) (3x-2) . (3x+2)=

f) (3x²-y²) . (3x²+y²)=

(2) calcule o quadrado das Diferenças:

a) (x²-1)²=

b) (3x-2y)²=

c) (x-y)²=

d) (6y-4)²=

e) (y-3)²=

ajuds pfv obg

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