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kirisaki

$$ \frac{ a+ 2 \sqrt{ab} + 9b }{ \sqrt{a} + 3 \sqrt{b} - 2 \sqrt[4]{ab} } \\ = \frac{ \left( \sqrt{a} + 3 \sqrt{b} - 2 \sqrt[4]{ab} \right) \left( \sqrt{a} + 3 \sqrt{b} + 2 \sqrt[4]{ab} \right) }{ \left( \sqrt{a} + 3 \sqrt{b} - 2 \sqrt[4]{ab} \right) } \\ = \left( \sqrt{a} + 3 \sqrt{b} + 2 \sqrt[4]{ab} \right) $$
 
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