Which of the following is a valid step in the solution of \root(4)(2x)+\root(4)(x+3)=0? \root(4)(2x))^(2)=(\root(4)(x+3))^(2)
(\root(4)(2x))^(2)=(-\root(4)(x+3))^(2)
(\root(4)(2x))^(4)=(\root(4)(x+3))^(4)
(\root(4)(2x))^(4)=(-\root(4)(x+3))^(4)

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