Dados os polinômios:
A = – x² + 4x – 2
B = 2x² – 3x + 1
C = – 2x² – 5x + 6
Calcule: a) A – (B – C)
f) A.B.D
a)
-x²+4x-2-[2x²-3x+1-(-2x²-5x+6)]=
-x²+4x-2-[2x²-3x-1+2x²+5x-6]=
-x²+4x-2-[4x²+2x-7]=
-x²-4x²+4x-2x-2+7=
-5x²+2x+5
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Verified answer
a)
-x²+4x-2-[2x²-3x+1-(-2x²-5x+6)]=
-x²+4x-2-[2x²-3x-1+2x²+5x-6]=
-x²+4x-2-[4x²+2x-7]=
-x²-4x²+4x-2x-2+7=
-5x²+2x+5