2x(x+4)=67

Solution for 2x(x+4)=67 equation:

2x(x+4)=67

We move all terms to the left:

2x(x+4)-(67)=0

We multiply parentheses

2x^2+8x-67=0

a = 2; b = 8; c = -67;
Δ = b2-4ac
Δ = 82-4·2·(-67)
Δ = 600
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:

$\sqrt{\Delta}=\sqrt{600}=\sqrt{100*6}=\sqrt{100}*\sqrt{6}=10\sqrt{6}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(8)-10\sqrt{6}}{2*2}=\frac{-8-10\sqrt{6}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(8)+10\sqrt{6}}{2*2}=\frac{-8+10\sqrt{6}}{4}
$