1 squared radical 40 is equal to 1 squared radical (4 x 10), and this become 2 squared radical 10. By adding 2 squared radical10 with 3 squared radical 10 we get 5 squared radical 10.
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what is 10 squared DOES NOT equal what?
40
if you want to factorise it then it will become (2x + 5)(x + 2) if it was equal to something then you would work it out differently. hope this helps
If I have this correct you are asking x^2 + 10^2 = 12^2 Then x=6.633249507108
Yes, this is usually written as 10 x 10 = 100 or 102 = 100