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717=9f+f2
We move all terms to the left:
717-(9f+f2)=0
We add all the numbers together, and all the variables
-(+9f+f^2)+717=0
We get rid of parentheses
-f^2-9f+717=0
We add all the numbers together, and all the variables
-1f^2-9f+717=0
a = -1; b = -9; c = +717;
Δ = b2-4ac
Δ = -92-4·(-1)·717
Δ = 2949
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$f_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$f_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$f_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-\sqrt{2949}}{2*-1}=\frac{9-\sqrt{2949}}{-2} $$f_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+\sqrt{2949}}{2*-1}=\frac{9+\sqrt{2949}}{-2} $
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