F(x)=3x^2-2x-5

Solution for F(x)=3x^2-2x-5 equation:

(F)=3F^2-2F-5

We move all terms to the left:

(F)-(3F^2-2F-5)=0

We get rid of parentheses

-3F^2+F+2F+5=0

We add all the numbers together, and all the variables

-3F^2+3F+5=0

a = -3; b = 3; c = +5;
Δ = b2-4ac
Δ = 32-4·(-3)·5
Δ = 69
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{-(3)-\sqrt{69}}{2*-3}=\frac{-3-\sqrt{69}}{-6}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{69}}{2*-3}=\frac{-3+\sqrt{69}}{-6}
$