r2=16.7

Solution for r2=16.7 equation:

r2=16.7

We move all terms to the left:

r2-(16.7)=0

We add all the numbers together, and all the variables

r^2-16.7=0

a = 1; b = 0; c = -16.7;
Δ = b2-4ac
Δ = 02-4·1·(-16.7)
Δ = 66.8
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-\sqrt{66.8}}{2*1}=\frac{0-\sqrt{66.8}}{2}
=-\frac{\sqrt{}}{2}
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{66.8}}{2*1}=\frac{0+\sqrt{66.8}}{2}
=\frac{\sqrt{}}{2}
$