x^2+2x-160=225

Solution for x^2+2x-160=225 equation:

x^2+2x-160=225

We move all terms to the left:

x^2+2x-160-(225)=0

We add all the numbers together, and all the variables

x^2+2x-385=0

a = 1; b = 2; c = -385;
Δ = b2-4ac
Δ = 22-4·1·(-385)
Δ = 1544
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:

$\sqrt{\Delta}=\sqrt{1544}=\sqrt{4*386}=\sqrt{4}*\sqrt{386}=2\sqrt{386}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{386}}{2*1}=\frac{-2-2\sqrt{386}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{386}}{2*1}=\frac{-2+2\sqrt{386}}{2}
$