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Alberto Ortega
Mathematics
31 October, 01:23
Factorise (x+y) ^2 - (4-x) ^2
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Shaylee Mack
31 October, 01:49
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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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