Barbara H. answered 03/03/15
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Enthusiastic mathematics teacher and World Record Swim Coach
5x - 5/x times 6x^2/9x - 9 (5x - 5/x)(6x^2/9x - 9) using foil: first, outside, inside, last
30x^3/9x - 45x - 30x^2/9x^2 + 45/x
10x^2/3 - 45x - 10/3 + 45/x
10/3(x^2 - 1) = 10/3 (x + 1)(x - 1)