Find a^2+9/a^2=31 what is the value of a-3/a
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a^2+9/a^2=31
a^2+(3/a)^2=31
a^2+(3/a)^2-6=31-6 Adding and subtracting 6 on both the sides
(a-3/a)^2=25
a-3/a=5
Therefore a-3/a=5
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