book Maths Puzzle Numerical Ability

I need to factor this trinomial completely???? 2a^3 - 52a^2b + 96ab^2. I am having a lot of trouble with these poloynomials - trinomials. Please help.

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book Other Question

Five years ago, Tom was one third as old as his dad was then. In 5 years, Tom will be half as old as his father will be then. Fine their ages now. A movie theater sells adult tickets at $5.50 a ticket and $3.50 for a childs ticket. How many of each ticket was sold if 21 tickets were bought for $83.50