factorise the following by regrouping X2 + xy + 5 x + 5 y
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ANSWER:
15(x+y)square - 5x+5y
= 15 (x+y)square - 5(x+y)
= 5(x+y) [3(x+y)-1]
=5(x+y) (3x+3y-1)
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