1.

(x³+2x²-5ax-7)÷x+1

Answer»

x^3 + 2x^2-5ax-7÷ x+1; x=-1, (-1)^3+2(-1)^2-5a(-1)-7; -1+2+5a-7=0; 5a=8-2; 5a=6; a=6/5



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