exam Maths Puzzle Numerical Ability

Solve

sqrt(y+4)=y-8

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exam Other Question

Could any one of you help me out in solving the below problem. I tried a lot, but failed.

ax + by = 4; ax^2 + by^2 = -3; ax^3 + by^3 = 2,
then what is the value of (2x-1)(2y-1)?

Thanks.
Trins What is the equation of the axis of symmetry of the function y=-2(x+3)^2+1?