exam Maths Puzzle Numerical Ability

I am trying to solve this problem

8a^2-18ay+7y^2

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exam Other Question

I know how to do these I really just need to be refreshed the question I am having trouble with is .5n(n+1)to the second power an investment adviser invested $14000 in two accounts. one investment earned 8% annual simple interest, an the other investment earned 6.5% annual simple interest. the amount of interest earned for 1 year was $1024. how much was investedin each account?