exam Maths Puzzle Numerical Ability

which of the following is the equivalant to the rational number x-2/x(x+2)
a. 4x-8/-4x
b. 4x/4x^2-2x
c. x-8/2x^2-8x
d. 4x-8/4x^2-8x

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exam Other Question

Please help! How do you factor the sums and differences of cubes. This isnt a problem from the text book. just an example.
d3 - e3. The threes in this problem are exponents. Simplify the followin: 4(2a-b)-3(a-2b)

This is what I have: 5a+2b is this right?

Thanks, Lackinmath