Factorise.
1) 15xy-6x+5y-2
2) ax+bx-ay-by
3) 15pq+15+9q+25p
4) z-7+7 x y-x y z
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15xy - 6x +5y - 2
15xy + 5y - 6x - 2
5y(3x + 1)- 2 (3x +1)
(5y - 2)(3x + 1)
Ax+bx-ay-by
(ax+bx)-(ay+by)
x(a+b)-y(a+b)
(a+b)(x-y)
15pq+9q+25p+15
=3q(5p+3) +5(5p+3)
=(3q+5) (5p+3) A
= (5p + 3)(3q + 5)
=(3q + 5) (5p + 3)
z - 7 + 7xy - xyz
= (z - 7) + xy(7 - z)
= (z - 7) - xy(z - 7)
= (z - 7)(1 - xy)
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