0.3*x^2-1.2*x-1008=0

Solution for 0.3*x^2-1.2*x-1008=0 equation:

0.3x^2-1.2x-1008=0

a = 0.3; b = -1.2; c = -1008;
Δ = b2-4ac
Δ = -1.22-4·0.3·(-1008)
Δ = 1211.04
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1.2)-\sqrt{1211.04}}{2*0.3}=\frac{1.2-\sqrt{1211.04}}{0.6}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1.2)+\sqrt{1211.04}}{2*0.3}=\frac{1.2+\sqrt{1211.04}}{0.6}
$