F(x)=x^2-16x+9

Solution for F(x)=x^2-16x+9 equation:

(F)=F^2-16F+9

We move all terms to the left:

(F)-(F^2-16F+9)=0

We get rid of parentheses

-F^2+F+16F-9=0

We add all the numbers together, and all the variables

-1F^2+17F-9=0

a = -1; b = 17; c = -9;
Δ = b2-4ac
Δ = 172-4·(-1)·(-9)
Δ = 253
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{-(17)-\sqrt{253}}{2*-1}=\frac{-17-\sqrt{253}}{-2}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(17)+\sqrt{253}}{2*-1}=\frac{-17+\sqrt{253}}{-2}
$