6x(x-2)=140

Solution for 6x(x-2)=140 equation:

6x(x-2)=140

We move all terms to the left:

6x(x-2)-(140)=0

We multiply parentheses

6x^2-12x-140=0

a = 6; b = -12; c = -140;
Δ = b2-4ac
Δ = -122-4·6·(-140)
Δ = 3504
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:

$\sqrt{\Delta}=\sqrt{3504}=\sqrt{16*219}=\sqrt{16}*\sqrt{219}=4\sqrt{219}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-12)-4\sqrt{219}}{2*6}=\frac{12-4\sqrt{219}}{12}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-12)+4\sqrt{219}}{2*6}=\frac{12+4\sqrt{219}}{12}
$