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10 February, 16:46

Identify the roots f (x) = 3x^2-27

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Answers (2)
  1. 10 February, 17:04
    0
    Factour ouf 3

    f (x) = 3 (x²-9)

    recognize diference of 2 perfect squres

    a²-b² = (a+b) (a-b)

    x²-9=x²-3² = (x+3) (x-3)

    so

    f (x) = 3 (x+3) (x-3)

    seto to zero to find roots

    0=3 (x+3) (x-3)

    0=x+3

    -3=x

    0=x-3

    3=x

    roots at x=-3 and 3
  2. 10 February, 17:11
    0
    The answer is x=3, - 3
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