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19 April, 23:33

How do you factorise x^2 - 9.

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  1. 20 April, 00:03
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    X ^ 2 - 9

    = x ^ 2 - 3 ^ 2

    It turns into 3 ^ 2

    Because 3 ^ 2 = 9

    The final answer is

    = (x + 3) (x - 3)

    remember the formula:

    a^2 - b^2 = (a+b) (a-b)
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