Dados os polinômios A=x³-x²-5x+1 e B=x³-3x²-x-1, então A-B vale: a. 2x²-4x
b. 2x³+2x²-4x+2
c. -2x²-4x+2
d. 2x²-4x+2
b. 2x³+2x²-4x+2
c. -2x²-4x+2
d. 2x²-4x+2
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