-1,2x2-7x=0

Solution for -1,2x2-7x=0 equation:

-1.2x^2-7x=0

a = -1.2; b = -7; c = 0;
Δ = b2-4ac
Δ = -72-4·(-1.2)·0
Δ = 49
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{49}=7$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-7)-7}{2*-1.2}=\frac{0}{-2.4}
=0
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-7)+7}{2*-1.2}=\frac{14}{-2.4}
=-5+1/1.2
$