JEE Main & Advanced JEE Main Paper (Held On 8 April 2017)

  • question_answer
    Let p (x) be a quadratic polynomial such that p(0)=1. If p(x) leaves remainder 4 when divided by x-1 and it leaves remainder 6 when divided by x + 1, then:             [JEE Online 08-04-2017]

    A) \[p(-2)=19\]                      

    B) \[p(2)=19\]

    C) \[p(-2)=11\]                      

    D) \[p(2)=11\]

    Correct Answer: A

    Solution :

    \[p(x)=a{{x}^{2}}+bx+c\] \[p(0)=1=c=1\] \[\left. \begin{align}   & p(1)=4 \\  & p(-1)=6 \\ \end{align} \right]\] \[\left. \begin{align}   & a+b+c=4 \\  & a-b+c=6 \\ \end{align} \right]=\left. \begin{align}   & a=4 \\  & b=-1 \\ \end{align} \right]\] \[p(x)=4{{x}^{2}}-x+1\] \[p(-2)=16+2+1=19\]


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