exam Maths Puzzle Numerical Ability

(the square root of x + 3 times the square root of y)(the square root of x - 3 times the square root of y)=

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exam Other Question

give the y values for x=-2,-1,0,1,2,3 for the function y=1/x-1 What is ((x^2-4)/(5x))*(30/(3x-6))?
I got (30x^2+2)/(8x) but its wrong?
Thanks!