X2+2x=145

Solution for X2+2x=145 equation:

X2+2X=145

We move all terms to the left:

X2+2X-(145)=0

We add all the numbers together, and all the variables

X^2+2X-145=0

a = 1; b = 2; c = -145;
Δ = b2-4ac
Δ = 22-4·1·(-145)
Δ = 584
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:

$\sqrt{\Delta}=\sqrt{584}=\sqrt{4*146}=\sqrt{4}*\sqrt{146}=2\sqrt{146}$
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{146}}{2*1}=\frac{-2-2\sqrt{146}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{146}}{2*1}=\frac{-2+2\sqrt{146}}{2}
$