book Maths Puzzle Numerical Ability

Can you help me simplify this:
a^2(2a + 4)

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book Other Question

One number is 2 more than twice another. If the product of the numbers is 2 more than twice their sum, find the numbers. western state is 18 yrs older than southern state. western is 2.5 times as old as southern. how old is each. choices for southerns state age 12, 14 and 18 thank you