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The operation * is defined for non-zero a and b as follows: a * b = 1/a^2 + 1/b^2. If a+b = 13 and ab = 25, what is the value of a*b? Express your answer as a common fraction.

 Aug 4, 2021
 #1
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ab = 25    is stated in your question.....

 Aug 4, 2021
 #2
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Disregard.......re-read the Q .....

Guest Aug 4, 2021
 #3
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As follows:

 

 Aug 4, 2021

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