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1 February, 04:12

Factorise (x+y) ^2 - (4-x) ^2

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  1. 1 February, 06:05
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    by using the identity a square - b square = (a+b) * (a-b)

    a = x+y

    b=4-x

    = (x+y + 4-x) (x+y - 4-x)

    y+4 * x+y - 4+x

    y+4*2x+y-4

    2xy+y square - 4y + yx + 4x + 4y - 16 + 4x

    3xy + y square + 8x - 16
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