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Solving More Radical Equations

ACTMAT-R9X41T

For what real values of $x$ does:

$$ \sqrt [ 4 ]{ { x }^{ 2 }-6x } =2 $$

A

$\text{8 only}$

B

$\text{-8 only}$

C

$\text{2 only}$

D

$\text{-2 only}$

E

$\text{-2 and 8}$