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A number squared means that the number is multiplied by itself.
The given expression can be simplified to: 8x squared +9
a quantity representing the power to which a fixed number (the base) must be raised to produce a given number.
If a number is to the power of 2 it is "squared". The number that is squared is the "root".
An odd number squared would always equal an odd number and an even number squared would always equal an even