F(x)=25-x2

Solution for F(x)=25-x2 equation:

(F)=25-F2

We move all terms to the left:

(F)-(25-F2)=0

We add all the numbers together, and all the variables

-(-1F^2+25)+F=0

We get rid of parentheses

1F^2+F-25=0

We add all the numbers together, and all the variables

F^2+F-25=0

a = 1; b = 1; c = -25;
Δ = b2-4ac
Δ = 12-4·1·(-25)
Δ = 101
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{101}}{2*1}=\frac{-1-\sqrt{101}}{2}
$
$F_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1)+\sqrt{101}}{2*1}=\frac{-1+\sqrt{101}}{2}
$