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Find the value of f (x)=3x^3-4x^2+7x+5 …

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Find the value of f (x)=3x^3-4x^2+7x+5 when x=3 and x=-3

    • Posted by Vijay Laxmi 5 years, 2 months ago

    CBSE > Class 09 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 2 months ago

    p(x) = 3x3 - 4x2 + 7x - 5

    Remainder when x = 3 divides p(x) is

     p(3) = 3 33 - 4 32 + 7 3 - 5

    = 3 27 - 4 9 + 21 - 5 = 61

    Remainder when x = - 3 divides p(x) is

      p(-3) = 3 (-3)3 - 4(-3)2 + 7 (-3) - 5

    = 3 (-27) - 4 9 - 21 - 5

    = -143

    Therefore, the required remainders are 61 and -143.

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