book Maths Puzzle Numerical Ability

multiply

(sqrt x+4-sqrt x-4)^2

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book Other Question

Subtraction problem

Find the missing values of A, B and C where A>B and B>C in the following subtraction problem. ABC-CBA=CAB

I need help on this quick!
How do I solve this equation

4x+7y=1303560

What are the optimum values for x & y?