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20 March, 23:22

Given the function:

f (x) = 5x3+8x2-7x-6

Choose 1 of the possible roots and show or describe how you know it is an actual root.

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Answers (2)
  1. 21 March, 02:36
    0
    A=R so,

    if x=2, f (2) = 15+16-7*2-6=25-14=11

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  2. 21 March, 03:01
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    x = 1 is a root of the polynomial

    For any polynomial f (x), if x = a is a root then f (a) = 0

    f (1) = 5 + 8 - 7 - 6 = 0

    Hence x = 1 is a root of f (x)
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