If a+b=7, and a*b=9, what is 1/a + 1/b???
7/9, the top is the (a+b) and bottom is (a*b)
(a+b)/(a*b) = 7/9 (Given) expand
a/(a*b) + b/(a*b) = 7/9 simplify
1/b + 1/a = 7/9 Ta-Da !
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