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= 5 (a + b)
2.ab - cb = (a.b -c.b)
= b (a - c)
3.x2+xy = (x.2 + x.y)
= x (2 + y)
4.3ab-3bc= (3.a.b - 3.b.c )
= 3b ( a - c )
6. 8a2 - 2ab + 6ac = (8.a.2 - 2.a.b + 6.a.c)
= (16a - 2ab + 6ac)
=a (16 - 2b + 6c)
7. 12ab2 - 8a2b + 20a2bc = ( 12.a.b.2 - 8.a.2.b + 20.a.2.b.c )
= (24ab - 16ab + 40abc )
= ab (24 - 16 + 40 c)
= ab ( 8 + 40c)
8. 10p2 + 15pq - 20pr = (10.p.2 + 15.p.q - 20.p.r)
= (20p + 15pq -20pr)
= p (20 + 15q -20r)