121r^2=4

Solution for 121r^2=4 equation:

121r^2=4

We move all terms to the left:

121r^2-(4)=0

a = 121; b = 0; c = -4;
Δ = b2-4ac
Δ = 02-4·121·(-4)
Δ = 1936
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1936}=44$
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-44}{2*121}=\frac{-44}{242}
=-2/11
$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+44}{2*121}=\frac{44}{242}
=2/11
$