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16 July, 20:37

What's ... factorise: 25x²-y²?

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  1. 16 July, 20:58
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    Factorising an equation is putting it into bracket form.

    This has square numbers and so needs double brackets

    (5x - y) (5x+y)

    If you then check this by multiplying the brackets out again you will get:

    5x^2 - 5xy + 5xy - y^2

    The positive and negative 5xy's cancel each other out and you are left with its original form. Your answer is

    (5x - y) (5x+y)
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