2x(x-4)=34

Solution for 2x(x-4)=34 equation:

2x(x-4)=34

We move all terms to the left:

2x(x-4)-(34)=0

We multiply parentheses

2x^2-8x-34=0

a = 2; b = -8; c = -34;
Δ = b2-4ac
Δ = -82-4·2·(-34)
Δ = 336
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:

$\sqrt{\Delta}=\sqrt{336}=\sqrt{16*21}=\sqrt{16}*\sqrt{21}=4\sqrt{21}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-8)-4\sqrt{21}}{2*2}=\frac{8-4\sqrt{21}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-8)+4\sqrt{21}}{2*2}=\frac{8+4\sqrt{21}}{4}
$