F(x)=2x^2+6x-4

Solution for F(x)=2x^2+6x-4 equation:

(F)=2F^2+6F-4

We move all terms to the left:

(F)-(2F^2+6F-4)=0

We get rid of parentheses

-2F^2+F-6F+4=0

We add all the numbers together, and all the variables

-2F^2-5F+4=0

a = -2; b = -5; c = +4;
Δ = b2-4ac
Δ = -52-4·(-2)·4
Δ = 57
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{-(-5)-\sqrt{57}}{2*-2}=\frac{5-\sqrt{57}}{-4}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5)+\sqrt{57}}{2*-2}=\frac{5+\sqrt{57}}{-4}
$