5 squared is 5^(2) = 5 x 5 = 25
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its like 5 to the second power. 52
what ever square it is you multiply it by its self example
3 squared =3 to the power of 3= 3x3=9
3 squared is 9, 5 squared is 25. So the product is 225.
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The square root of 5 squared is 5, which is a rational number.
If x squared = 5 then x = sqrt(5) = ± 2.2361 (approx).
you do this by 18*18