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Old 07-24-2007   #3
MamaMia
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2/(5x + 45) + x/(x²-81)= 2/5(x-9) + x/(x+9)(x-9)= 2(x+9)/5(x+9)(x-9) + 5x/5(x+9)(x-9)= [2(x+9) + 5x] / 5(x+9)(x-9)= 2x + 18 + 5x / 5(x+9)(x-9)= 7x + 18 / 5(x+9)(x-9)