[x^2-9]/[5x+15]
Answers:
Ok, first of all, you must notice x^2-9 is a difference of 2 squares, i.e. x^2-9=(x+3)(x-3)
this gives (x^2-9)/(5x+15)=(x+3)(x-3)/5(x... (5x+15=5*(x+3)) and so (x^2-9)/(5x+15)= (x-3)/5
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