f(2)=-0.4+16.3

Solution for f(2)=-0.4+16.3 equation:

f(2)=-0.4+16.3

We move all terms to the left:

f(2)-(-0.4+16.3)=0

We add all the numbers together, and all the variables

f2-(15.9)=0

We add all the numbers together, and all the variables

f^2-15.9=0

a = 1; b = 0; c = -15.9;
Δ = b2-4ac
Δ = 02-4·1·(-15.9)
Δ = 63.6
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{-(0)-\sqrt{63.6}}{2*1}=\frac{0-\sqrt{63.6}}{2}
=-\frac{\sqrt{}}{2}
$
$f_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{63.6}}{2*1}=\frac{0+\sqrt{63.6}}{2}
=\frac{\sqrt{}}{2}
$