exam Maths Puzzle Numerical Ability

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.

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exam Other Question

Simplify the expression. Write your answer in scientific notation.



(2.6 x 10^5)^2

Help with this question would be greatly appreciated.
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