0.6x^2-1.1x-1=0

Solution for 0.6x^2-1.1x-1=0 equation:

0.6x^2-1.1x-1=0

a = 0.6; b = -1.1; c = -1;
Δ = b2-4ac
Δ = -1.12-4·0.6·(-1)
Δ = 3.61
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{-(-1.1)-\sqrt{3.61}}{2*0.6}=\frac{1.1-\sqrt{3.61}}{1.2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.1)+\sqrt{3.61}}{2*0.6}=\frac{1.1+\sqrt{3.61}}{1.2}
$