X2+2x=0.75

Solution for X2+2x=0.75 equation:

X2+2X=0.75

We move all terms to the left:

X2+2X-(0.75)=0

We add all the numbers together, and all the variables

X^2+2X-0.75=0

a = 1; b = 2; c = -0.75;
Δ = b2-4ac
Δ = 22-4·1·(-0.75)
Δ = 7
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-\sqrt{7}}{2*1}=\frac{-2-\sqrt{7}}{2}
$
$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+\sqrt{7}}{2*1}=\frac{-2+\sqrt{7}}{2}
$