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Luizaelena02
a fost răspuns

Calculați : a) (x-3)²+(x-3)(x+3)
b)(x-y-3)²
c)(x+3√2)²+(x-3√2)²
Thx

Răspuns :

Renatemambouko
a) (x-3)²+(x-3)(x+3)=x²-6x+9+x²-9=2x²-6x=2x(x-3)

b)(x-y-3)²=x²+y²+9-2xy-6x-6y

c)(x+3√2)²+(x-3√2)²=x²+6√2x+18+x²-6√2x+18=2x²+36=2(x²+18)

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