(-1x+1.23)*x=0

Solution for (-1x+1.23)*x=0 equation:

(-1x+1.23)*x=0

We multiply parentheses

-1x^2+1.23x=0

a = -1; b = 1.23; c = 0;
Δ = b2-4ac
Δ = 1.232-4·(-1)·0
Δ = 1.5129
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{-(1.23)-\sqrt{1.5129}}{2*-1}=\frac{-1.23-\sqrt{1.5129}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(1.23)+\sqrt{1.5129}}{2*-1}=\frac{-1.23+\sqrt{1.5129}}{-2}
$