When you say x2, do you mean x squared? Just for future reference, if you want to ask questions like this that have powers, you can write this as x^2. If you do mean to ask about x squared, when x = 1, x squared is also 1.

When you sqaure a number, what you are doing is multiplying that number by itself. So 3 squared is 3*3 and that is 9. It is the same with 1 squared. But in this case, one times itself just comes out to 1.

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