x2-3x=234

Solution for x2-3x=234 equation:

x2-3x=234

We move all terms to the left:

x2-3x-(234)=0

We add all the numbers together, and all the variables

x^2-3x-234=0

a = 1; b = -3; c = -234;
Δ = b2-4ac
Δ = -32-4·1·(-234)
Δ = 945
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:

$\sqrt{\Delta}=\sqrt{945}=\sqrt{9*105}=\sqrt{9}*\sqrt{105}=3\sqrt{105}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-3\sqrt{105}}{2*1}=\frac{3-3\sqrt{105}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+3\sqrt{105}}{2*1}=\frac{3+3\sqrt{105}}{2}
$