3x(x-2)=121

Solution for 3x(x-2)=121 equation:

3x(x-2)=121

We move all terms to the left:

3x(x-2)-(121)=0

We multiply parentheses

3x^2-6x-121=0

a = 3; b = -6; c = -121;
Δ = b2-4ac
Δ = -62-4·3·(-121)
Δ = 1488
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{1488}=\sqrt{16*93}=\sqrt{16}*\sqrt{93}=4\sqrt{93}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-4\sqrt{93}}{2*3}=\frac{6-4\sqrt{93}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+4\sqrt{93}}{2*3}=\frac{6+4\sqrt{93}}{6}
$