-0.88x^2-1.9x+1=0

Solution for -0.88x^2-1.9x+1=0 equation:

-0.88x^2-1.9x+1=0

a = -0.88; b = -1.9; c = +1;
Δ = b2-4ac
Δ = -1.92-4·(-0.88)·1
Δ = 7.13
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{-(-1.9)-\sqrt{7.13}}{2*-0.88}=\frac{1.9-\sqrt{7.13}}{-1.76}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.9)+\sqrt{7.13}}{2*-0.88}=\frac{1.9+\sqrt{7.13}}{-1.76}
$