56+4.m^2=120

Solution for 56+4.m^2=120 equation:

56+4.m^2=120

We move all terms to the left:

56+4.m^2-(120)=0

We add all the numbers together, and all the variables

4.m^2-64=0

a = 4.; b = 0; c = -64;
Δ = b2-4ac
Δ = 02-4·4.·(-64)
Δ = 1024
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{1024}=32$
$m_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-32}{2*4.}=\frac{-32}{8}
=-4
$
$m_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+32}{2*4.}=\frac{32}{8}
=4
$