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find k if -2 is zero …

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find k if -2 is zero of polynomial 4x^2-x+k

    • Posted by Priya Kalra 6 years, 6 months ago

    CBSE > Class 09 > Mathematics
    • 2 answers

    Priya Kalra 6 years, 6 months ago

    x = -2
    f(x) = 4x2-x+k
    4(-2)2 - (-2)+ k = 0
    4(4) + 4 + k = 0
    16 + 4 + k = 0
    20 + k = 0
    k = -20

    You have written 4 but I think here must be 2 instead of 4

     

     

     

    0Thank You

    Yogita Ingle 6 years, 6 months ago

    x = -2
    f(x) = 4x2-x+k
    4(-2)2 - (-2)+ k = 0
    4(4) + 4 + k = 0
    16 + 4 + k = 0
    20 + k = 0
    k = -20

    1Thank You

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