2.645 squared equals 7.
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Unclear what you're asking:
If x=7, then x^2 (that is, "x squared") equals 49.
or
If x^2=7, then x equals the square root of 7, or about 2.64575
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Seven squared = 7 x 7 = 49
If x is equal to 5, then x squared plus 25 is equal to 50.
3 squared is 3 x 3 or 9.
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x squared means x times x. Since x can be any number, x times x can also be any number.