a fost răspuns

Fie E(x)=x la a3a +5x la a2a-7x-6. Calculati E(-2)•E(0)

Răspuns :

E(x)=x³+5x²-7x-6
E(-2)=(-2)³+5·(-2)²-7·(-2)-6=-8+5·4+14-6=-8+20+8=+20
E(0)=0³+5·0²-7·0-6=0+0-7-6=-13
E(-2)·E(0)=20·(-13)=-260

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