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Equation x2 = 2x

For the equation x2 = 2x we have x = 2 as a simple solution. But there is another solution that you can easily guess.

 


Explanation

And that is x = 4 because

42 = 24     ⇒     16 = 16

We haven't seen that in a hurry. You'll have to look for it. The next question is of course: Are there any other solutions?

 


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