x^2-2x=153

Solution for x^2-2x=153 equation:

x^2-2x=153

We move all terms to the left:

x^2-2x-(153)=0

a = 1; b = -2; c = -153;
Δ = b2-4ac
Δ = -22-4·1·(-153)
Δ = 616
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:

$\sqrt{\Delta}=\sqrt{616}=\sqrt{4*154}=\sqrt{4}*\sqrt{154}=2\sqrt{154}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-2)-2\sqrt{154}}{2*1}=\frac{2-2\sqrt{154}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-2)+2\sqrt{154}}{2*1}=\frac{2+2\sqrt{154}}{2}
$