Its square root an irrational number and it is about 9.3 rounded to one decimal place
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The square root of 86 is approximately 9.2736. To find this, you can first estimate the square root of 86 to be between 9 and 10. Then, using a method like the Babylonian method, you can iteratively refine your estimate until you reach a desired level of accuracy.
Expressed as a decimal, 86/1000 is equal to 0.086.
86% = 0.86
Answers are 45 and -2. ((86/2) +/- square-root of ((86/2)**2+4*1*90))/2