x^2+2x+100=750

Solution for x^2+2x+100=750 equation:

x^2+2x+100=750

We move all terms to the left:

x^2+2x+100-(750)=0

We add all the numbers together, and all the variables

x^2+2x-650=0

a = 1; b = 2; c = -650;
Δ = b2-4ac
Δ = 22-4·1·(-650)
Δ = 2604
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:

$\sqrt{\Delta}=\sqrt{2604}=\sqrt{4*651}=\sqrt{4}*\sqrt{651}=2\sqrt{651}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-2\sqrt{651}}{2*1}=\frac{-2-2\sqrt{651}}{2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+2\sqrt{651}}{2*1}=\frac{-2+2\sqrt{651}}{2}
$