(9/a+b)^2

Simplify expression, assume that a+b /=0

The line is in the middle of the "=" sign

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According to given question

(9/a+b)^2=0

by taking square on both sides

9/a+b=0

9/a=-b

9=-ab

other method is

taking square on both sides

by multiple a on both sides

9+ab=0

ab=-9

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