Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-11

  • question_answer
    The factors of \[4{{x}^{3}}+23{{x}^{2}}-41x-42\]are

    A)  \[(2x-7)(x+7)(4x+3)\]

    B)  \[\left( x-2 \right)\left( x+7 \right)\left( 4x+3 \right)\]

    C)  \[\left( x-2 \right)\left( x+7 \right)\left( x+7 \right)\]

    D)  None of the above

    Correct Answer: B

    Solution :

    \[\because \] \[4{{x}^{3}}+23{{x}^{2}}-41x-42\] is divisible by \[(x-2).\] \[\because \] \[4{{x}^{2}}+23{{x}^{2}}-41x-42\] \[=(x-2)(4{{x}^{2}}+31x+21)\] \[=(x-2)(4{{x}^{2}}+28x+3x+21)\] \[=(x-2)(x+7)(4x+3)\]


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