Algebra
posted by Mystery .
Simplify the complex rational expression
3/(x+5)+ 6/(x+3) ÷ (3x+13)/(x^2+8x+15)
(please show steps i already know the answer i need to know the steps)

Use the fact that
(x^2+8x+15) = (x+5)(x+3)
Muliply numerator and denominator by that and you will get some big simplifications.
[3(x+3) + 6(x+5)] /(3x +13)
= (9x + 39)/(3x +13)
Do you see another simplication? Factor out "3" in the numerator.
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