1.6=x*x-3x

Solution for 1.6=x*x-3x equation:

1.6=x*x-3x

We move all terms to the left:

1.6-(x*x-3x)=0

We add all the numbers together, and all the variables

-(-3x+x*x)+1.6=0

We get rid of parentheses

3x-x*x+1.6=0

Wy multiply elements

-1x^2+3x+1.6=0

a = -1; b = 3; c = +1.6;
Δ = b2-4ac
Δ = 32-4·(-1)·1.6
Δ = 15.4
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{-(3)-\sqrt{15.4}}{2*-1}=\frac{-3-\sqrt{15.4}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(3)+\sqrt{15.4}}{2*-1}=\frac{-3+\sqrt{15.4}}{-2}
$