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Combine your skills of working with exponents and manipulating expressions for radical glory.

\[\Large \sqrt { -4 } \hspace{.1cm} \sqrt { -9 } = \ ? \]

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\[ \large \dfrac{\sqrt{50}+7}{\sqrt{50}-7}+\dfrac{\sqrt{50}-7}{\sqrt{50}+7} = \ ?\]

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\[ \Huge \sqrt{\color{red}9^{\color{green}{16} \color{blue}{x^2}}} \]

Which of the following is equal to the above expression?

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\[\Large{ \sqrt{3+2\sqrt2} - \sqrt{3-2\sqrt2} = \ ?} \]

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