Work out the higherand lower numbers so
the answer will be somewhere inbetween.
So 80 x 80 = 6400
and 90 x 90 = 8100
then 86 x 86 will be between 6400 and 8100
Actual answer is 7396 by the way.
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FOUR
(9x)2 +9x/(45x)2 +81= 9+9x/86
54+86
Answers are 45 and -2. ((86/2) +/- square-root of ((86/2)**2+4*1*90))/2
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.