exam Maths Puzzle Numerical Ability

What is the domain and range of this equation: x^2+y^2=256

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exam Other Question

What is the domain of 1/((4(x^3))-5x)? (x-3)/18 = 3/x

I didn't get this problem because it had x squared in it, and I didn't know how to solve. Please help! Thank you so much!