Question

1.A vendor purchased eggs at rs16 per dozen and sold at 10 for rs 18. Find Gain or loss percent.

2.Factorise: 9a2 - 30bc + 25b2 -36c2

3.Divide 4yz(z2 + 6z - 16) by 2y(z + 8)

Answer 1

(3a)^2-2.3a.5b+(5b)^2-(6c)^2
(3a-5b)^2-(6c)^2
(3a-5b+6c)(3a-5b-6c)

{4yz(z2 + 6z - 16)} /{2y(z + 8)}
=4yz (z2+8z-2z-16)/{2y(z + 8)}
={4yz(z+8)(z-2)}/{2y(z + 8)}
=2z (z-2)