258=3.14r(2)

Solution for 258=3.14r(2) equation:

258=3.14r(2)

We move all terms to the left:

258-(3.14r(2))=0

We add all the numbers together, and all the variables

-(+3.14r^2)+258=0

We get rid of parentheses

-3.14r^2+258=0

a = -3.14; b = 0; c = +258;
Δ = b2-4ac
Δ = 02-4·(-3.14)·258
Δ = 3240.48
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{3240.48}}{2*-3.14}=\frac{0-\sqrt{3240.48}}{-6.28}
=-\frac{\sqrt{}}{-6.28}
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{3240.48}}{2*-3.14}=\frac{0+\sqrt{3240.48}}{-6.28}
=\frac{\sqrt{}}{-6.28}
$