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-x^2+15x+10=0
We add all the numbers together, and all the variables
-1x^2+15x+10=0
a = -1; b = 15; c = +10;
Δ = b2-4ac
Δ = 152-4·(-1)·10
Δ = 265
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{265}}{2*-1}=\frac{-15-\sqrt{265}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(15)+\sqrt{265}}{2*-1}=\frac{-15+\sqrt{265}}{-2} $
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