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11 January, 20:15

X^2 - 9

find roots now

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Answers (2)
  1. 11 January, 20:25
    0
    There are 2 ways to do this.

    1) First you need to factor x² - 9.

    x² - 9 = (x + 3) (x - 3)

    So x = - 3, 3.

    2) Let x² - 9 = 0

    So then add 9 to both sides and you'll get:

    x² = 9

    Square root both sides and you'll get:

    x = ± 3 (Which is the same thing for - 3, 3)
  2. 11 January, 22:28
    0
    x = 3, - 3

    Step-by-step explanation:

    To find the roots, or solutions/zeros to this problem first you need to factor the quadratic equation.

    In its factored form it looks like this:

    (x + 3) (x - 3)

    Make both of these factors equal to 0 to find the roots.

    (x + 3) = 0

    Subtract 3 from both sides ... x = - 3.

    (x - 3) = 0

    Add 3 to both sides ... x = 3.

    The roots of this quadratic equation are 3 and - 3.
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