1. If $$x^3 + 2x^2 - 5x + k$$ is divisible by x + 1, then what is the value of k?
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By: anil on 05 May 2019 01.47 am
$$f(x)=x^3 + 2x^2 - 5x + k$$ is divisible by $$(x+1)$$ => $$x=-1$$ is a factor of $$f(x)$$ => $$f(-1)=0$$ => $$(-1)^3+2(-1)^2-5(-1)+k=0$$ => $$-1+2+5+k=0$$ => $$k=-6$$ => Ans - (A)
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