-0.05*x^2-12.875*x^2+11.875=0

Solution for -0.05*x^2-12.875*x^2+11.875=0 equation:

-0.05x^2-12.875x^2+11.875=0

We add all the numbers together, and all the variables

-12.925x^2+11.875=0

a = -12.925; b = 0; c = +11.875;
Δ = b2-4ac
Δ = 02-4·(-12.925)·11.875
Δ = 613.9375
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{-(0)-\sqrt{613.9375}}{2*-12.925}=\frac{0-\sqrt{613.9375}}{-25.85}
=-\frac{\sqrt{}}{-25.85}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{613.9375}}{2*-12.925}=\frac{0+\sqrt{613.9375}}{-25.85}
=\frac{\sqrt{}}{-25.85}
$