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5x-x^2+4=0
We add all the numbers together, and all the variables
-1x^2+5x+4=0
a = -1; b = 5; c = +4;
Δ = b2-4ac
Δ = 52-4·(-1)·4
Δ = 41
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{-(5)-\sqrt{41}}{2*-1}=\frac{-5-\sqrt{41}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{41}}{2*-1}=\frac{-5+\sqrt{41}}{-2} $
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