3x^2-8x-69=0

Solution for 3x^2-8x-69=0 equation:

3x^2-8x-69=0

a = 3; b = -8; c = -69;
Δ = b2-4ac
Δ = -82-4·3·(-69)
Δ = 892
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:

$\sqrt{\Delta}=\sqrt{892}=\sqrt{4*223}=\sqrt{4}*\sqrt{223}=2\sqrt{223}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-2\sqrt{223}}{2*3}=\frac{8-2\sqrt{223}}{6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+2\sqrt{223}}{2*3}=\frac{8+2\sqrt{223}}{6}
$