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How To Solve This 9x²-72=0 I Did Not How To Solve This?

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Raquelviz
9x^2 -72
a=9
b=0
c=-72
-b+- sqrt of b^2-4ac
            2a
 -(0)+- sqrt of (0)^2 -4(9)(-72)
                   2(9)
 +- sqrt of +2592
           18
 +- sqrt of 72 times sqrt of 36
                    18
x1=  6sqrt72
           18
 x2=  -6sqrt72
           18