Question

$\sqrt[9]{4} = \sqrt[x]{4}$
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Answer 1

$\sf \sqrt[9]{4} = \sqrt[x]{4} \\ \\\sf \frac{1}{9} = \frac{1}{x} \\ \\\sf \frac{x}{9} = 1 \\ \\\sf x = 1 \times 9 \\ \\\sf \color{green} {x = 9}$