Which equation shows a valid, practical step in solving 4th root of 2 x minus 8 plus 4th root of 2 x plus 8 is equal to 0 ?

First isolate one radical: the fourth root of 2x − 8 equals the negative of the fourth root of 2x + 8. Raising both sides to the fourth power gives choice B. The negative sign is included inside the parentheses, and taking the fourth power removes it because an even power of a negative number is positive.

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