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14-15x-x2=0
We add all the numbers together, and all the variables
-1x^2-15x+14=0
a = -1; b = -15; c = +14;
Δ = b2-4ac
Δ = -152-4·(-1)·14
Δ = 281
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{-(-15)-\sqrt{281}}{2*-1}=\frac{15-\sqrt{281}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{281}}{2*-1}=\frac{15+\sqrt{281}}{-2} $
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