Asked by Anonymous

I don't understand how √ 4x=2x. Is this a mistake? I thought 4x can not be square root because the 4 has an x next to it.
Answered by Ms. Sue
Suppose x = 1?

Answered by Anonymous
What? Just think x as1 and square root 4x. Is that right?
Answered by Reiny
If you meant (√4)(x) , then it is indeed 2x
if you meant √(4x) = 2x, then it is true only for x=0 and x=1, it is false for all other values of x

let's solve
√(4x) = 2x
square both sides:
4x = 4x^2
4x^2 - 4x = 0
4x(x - 1) = 0
so x = 0 or x = 1
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