0=1.19-1.87r^2

Solution for 0=1.19-1.87r^2 equation:

0=1.19-1.87r^2

We move all terms to the left:

0-(1.19-1.87r^2)=0

We add all the numbers together, and all the variables

-(1.19-1.87r^2)=0

We get rid of parentheses

1.87r^2-1.19=0

a = 1.87; b = 0; c = -1.19;
Δ = b2-4ac
Δ = 02-4·1.87·(-1.19)
Δ = 8.9012
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{8.9012}}{2*1.87}=\frac{0-\sqrt{8.9012}}{3.74}
=-\frac{\sqrt{}}{3.74}
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+\sqrt{8.9012}}{2*1.87}=\frac{0+\sqrt{8.9012}}{3.74}
=\frac{\sqrt{}}{3.74}
$