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jmc

algebra senior

Problem

Find the interval of all such that both and are in the interval .
Solution
If , then, dividing all the expressions in these inequalities by , we have .

If , then, dividing all the expressions by , we have .

Given that satisfies both inequalities, we must have . In interval notation, the set of common solutions is .
Final answer
\left(\frac{1}{2},\frac{2}{3}\right)