Difference of two squares: a^2 - b^2 = (a - b)( a + b)
Difference of two cubes: a^3 - b^3 = (a - b)(a^2 + ab + b^2)
Sum of two cubes: a^3 + b^3 = (a + b)(a^2 - ab + b^2)
A tough part I felt I had trouble with in this section was the rationalization of the numerator. It felt odd to try and do it. Like it shouldn't have worked but in the end it did somehow.
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