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If a+b=7, and a*b=9, what is 1/a + 1/b???

 Feb 24, 2019
 #1
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7/9, the top is the (a+b) and bottom is (a*b)

 Feb 24, 2019
 #2
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+1

(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 !

 Feb 24, 2019

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