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25 March, 15:55

Factorise the following expressions m²-9n²

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  1. 25 March, 16:07
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    (m - 3n) (m + 3n).

    Step-by-step explanation:

    This is the difference of 2 squares, so we use the identity:

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

    So m^2 - 9n^2

    (m - 3n) (m + 3n).
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