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23 January, 10:00

Show that the expression (x+y) (x-y) - 14x+49 may be written as the difference of two squares.

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  1. 23 January, 11:24
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    For

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

    x^2-y^2-14x+49

    x^2-14x+49-y^2

    (x-7) ^2-y^2

    (x-7-y) (x-7+y)

    or

    (x-y-7) (x+y-7)
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