Question 419597
"add or sutract. simplify as much as possible
2a + 8/a +17 minus a-9/a+17"


When adding and subtracting fractions, you need a common denominator.
In this one, you already have the common denominator, 
so just combine the numerators and put over the common denominator


(2a + 8)/(a + 17) - (a - 9)/(a + 17)


(2a + 8) - (a - 9)
------------------
a + 17


2a + 8 - a + 9 
--------------- {took out parentheses in numerator}
a + 17


a + 17
------- {combined like terms in numerator}
a + 17


= 1 {cancelled}
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