Remove anything that appears twice. Outside the radical it is just one factor. So remove 2*2 and x*x. Outside the radical those are 2x which leaves -1*2*x or -2x inside the radical.

But for square root there can't be a negative number inside the radical. The square root of -1 is the imaginary number i. So this becomes

If the problem is a cuberoot then pull out anything that's shown three times, and the factor is negative because -*-*- = -. So the answer would be -2x.

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