exam Maths Puzzle Numerical Ability

I am having problems factoring this trinomial. The problem is 8a^2-18ay+7y^2. I would appreciate if someone could help me.
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exam Other Question

bhagwanti inherited Rs.12000/-. she invested part of it as 10% and the rest at 12%. Her annual income from these investment is Rs.1280/- how much did she invest at each rate. In Triangle ABC, it is given that CA=CB. Points P and Q are marked on segments CA and CB respectively, so that angles CBP and CAQ are the same size. Prove that CP=CQ.
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