x squared means x times x. Since x can be any number, x times x can also be any number.
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If x is equal to 5, then x squared plus 25 is equal to 50.
3 squared is 3 x 3 or 9.
If x squared is not 5, then x is not equal to 5. Do not fall for the trap that the converse is "if x-squared = 25 then x = 5" since that is not a true statement.
289 squared times 289 squared is equal to 6,975,757,441.
Cos^2 x = 1 - sin^2 x