book Maths Puzzle Numerical Ability

The directions on my paper read: Subtract the sum of the last two polynomials from the sum of the first two. Please help me.

1.) 2x^2-14xy+7y^2
2.) 3x^2-2

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book Other Question
What is the sum of (2n+1)squared using 0<n<infinity? Find a counter-example to the statement 4^n+1 is divisible by 5.

Thank You