722 = 72 x 72 = 5184
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xsquared minus x minus 72
72 = 7*7 = 49
72 although, if the superscript is not available, you could write it as 7^2. Incidentally, you would have to use the ^ format in spreadsheets.
The square root of 72 is between 8 and 9 BECAUSE 8 squared is 64 9 squared is 81 since 72 lies between 64 and 81, then the square root must lie between 8 and 9
64 and 81 ; 64 is 8 squared and 81 is 9 squared