3m(m-2)-11=0

Solution for 3m(m-2)-11=0 equation:

3m(m-2)-11=0

We multiply parentheses

3m^2-6m-11=0

a = 3; b = -6; c = -11;
Δ = b2-4ac
Δ = -62-4·3·(-11)
Δ = 168
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{168}=\sqrt{4*42}=\sqrt{4}*\sqrt{42}=2\sqrt{42}$
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2\sqrt{42}}{2*3}=\frac{6-2\sqrt{42}}{6}
$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2\sqrt{42}}{2*3}=\frac{6+2\sqrt{42}}{6}
$