book Maths Puzzle Numerical Ability

Polynomials: What is X^3-64=0?
thank you.

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book Other Question

Please help me determine the center and radius of the circle with equation:
x^2+y^2=-4x+6y
Thank you Simplify each of the following, Assume a, x and y are not zero.

1)8x
--
24

2)15a2
----
25a

3)10*2
----
10*3

4) -x2y
------
(-x2)2y2