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0=x^2-13x-204
We move all terms to the left:
0-(x^2-13x-204)=0
We add all the numbers together, and all the variables
-(x^2-13x-204)=0
We get rid of parentheses
-x^2+13x+204=0
We add all the numbers together, and all the variables
-1x^2+13x+204=0
a = -1; b = 13; c = +204;
Δ = b2-4ac
Δ = 132-4·(-1)·204
Δ = 985
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(13)-\sqrt{985}}{2*-1}=\frac{-13-\sqrt{985}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+\sqrt{985}}{2*-1}=\frac{-13+\sqrt{985}}{-2} $
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