The outside of an aquarium tank is 50 cm long, 40 cm wide, and 20 cm high. It is open at the top. The glass used to make the tan
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First of all, we can observe that
So the expression becomes
This means that the expression is defined for every
Now, since the denominator is always positive (when it exists), the fraction can only be positive if the denominator is also positive: we must ask
Since we can't accept 3 as an answer, the actual solution set is