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Nechitamagdale
a fost răspuns

Va rog please
  
a) (x+2)(x+3)=
b) (x²+2)(x-5)=
c) ( x-3)(x²+3x+9)=
d) (x²+2x-6)(2x²-x-3) 

Va rog... cat mai corectt

Răspuns :

Deeamadalina
a) x(x+3)+2(x+3)=x²+3x+2x+6=x²+5x+6
b) x²(x-5)+2(x-5)=x³-5x²+2x-10
c) x(x²+3x+9)-3(x²+3x+9)=x³+3x²+9x-3x²-9x-27=x³-27
d) x²(2x²-x-3)+2x(2x²-x-3)-6(2x²-x-3)=2x⁴-x³-3x²+4x³-2x²-6x-12x²+6x+18=2x⁴+3x³-17x²+18

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