-n^2-1.2n=0

Solution for -n^2-1.2n=0 equation:

-n^2-1.2n=0

We add all the numbers together, and all the variables

-1n^2-1.2n=0

a = -1; b = -1.2; c = 0;
Δ = b2-4ac
Δ = -1.22-4·(-1)·0
Δ = 1.44
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1.2)-\sqrt{1.44}}{2*-1}=\frac{1.2-\sqrt{1.44}}{-2}
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.2)+\sqrt{1.44}}{2*-1}=\frac{1.2+\sqrt{1.44}}{-2}
$