F(x)=-2x^2-11x+5

Solution for F(x)=-2x^2-11x+5 equation:

(F)=-2F^2-11F+5

We move all terms to the left:

(F)-(-2F^2-11F+5)=0

We get rid of parentheses

2F^2+11F+F-5=0

We add all the numbers together, and all the variables

2F^2+12F-5=0

a = 2; b = 12; c = -5;
Δ = b2-4ac
Δ = 122-4·2·(-5)
Δ = 184
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$F_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{184}=\sqrt{4*46}=\sqrt{4}*\sqrt{46}=2\sqrt{46}$
$F_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(12)-2\sqrt{46}}{2*2}=\frac{-12-2\sqrt{46}}{4}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(12)+2\sqrt{46}}{2*2}=\frac{-12+2\sqrt{46}}{4}
$