11b^2-12b-6=0

Solution for 11b^2-12b-6=0 equation:

11b^2-12b-6=0

a = 11; b = -12; c = -6;
Δ = b2-4ac
Δ = -122-4·11·(-6)
Δ = 408
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{408}=\sqrt{4*102}=\sqrt{4}*\sqrt{102}=2\sqrt{102}$
$b_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-2\sqrt{102}}{2*11}=\frac{12-2\sqrt{102}}{22}
$
$b_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+2\sqrt{102}}{2*11}=\frac{12+2\sqrt{102}}{22}
$