The way you make a little 2 is by:
Holding the alt gear on the left hand side of the keyboard and press del at the same time...
holding it and pressing the numbers 2, 5, and 3 you should get "²"
If you want to get a little 2 on a Microsoft website...
Hold the alt gear and press the numbers 0, 1, 7, 8 and there you have it!!! "²"
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2x -2 squared = 0
2^2 + 3^2 = 4 + 9 = 13
x^2+2x^2=3x^2
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
A^2-2ab+B^2 is actually (A+B)^2 AB squared is A^2B^2 or (AB)^2