F(x)=x2+2X-3

Solution for F(x)=x2+2X-3 equation:

(F)=F2+2F-3

We move all terms to the left:

(F)-(F2+2F-3)=0

We add all the numbers together, and all the variables

-(+F^2+2F-3)+F=0

We get rid of parentheses

-F^2-2F+F+3=0

We add all the numbers together, and all the variables

-1F^2-1F+3=0

a = -1; b = -1; c = +3;
Δ = b2-4ac
Δ = -12-4·(-1)·3
Δ = 13
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$F_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$F_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-\sqrt{13}}{2*-1}=\frac{1-\sqrt{13}}{-2}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+\sqrt{13}}{2*-1}=\frac{1+\sqrt{13}}{-2}
$