Question 176593
f(x)=x^2-9x+58
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I assume you are looking for the roots of the function:
x^2 - 9x  + 5 = 0
Use the quadratic formula:

x = [9 +- sqrt(81 - 4*1*5)]/2

x = [9 +- sqrt(81 - 20)]/2

x = [9 +- sqrt(61)]

x = [9 +- 7.8102]/2

x = 8.405.. or  x= 0.5949..
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Cheers,
Stan H.