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(5x-3)^2 is an expression. You can't solve expressions.
^2 means to the second power
when they say a number is "to a power" like "5 to the second power" its the same thing as 52 read "5 squared" to solve this all you have to do is 5x5=25. if you have "3 to the fourth power" you would do 34 which is the same as 3x3x3x3=81.
1 over 5^2. which is 1/25
5
odd
5 to the second power = 5*5 = 25