book Maths Puzzle Numerical Ability

I need help in answering this problem:
(2x^2 + y^2)^2
I have to simplify it.

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book Other Question

The sum of a certain number and second number is -42. The first number minus the second number is 52. Find the numbers. 4x+7=3x+18 can you show me the proper way to do this multisteip equation
4x+3x=8x/8x+7=18
-8 -8
7/26=4