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26 April, 23:04

Factorise x (squared) + 7x - 30

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  1. 26 April, 23:28
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    X^2+7x-30

    what we do is we find what 2 number multiply to get - 30 and add to get 7

    factor 30

    30=2 times 3 times 5

    we know that is has to be negative eventually so one is negative and one is positivie so we do2 factors and add

    2 times 5=10

    10 and - 3

    add

    10-3=7

    checks

    10 times - 3=-30

    so we put those in

    (x-3) (x+10)

    factored
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