-0.001(x*x)+0.44x+2.75=0

Solution for -0.001(x*x)+0.44x+2.75=0 equation:

-0.001(x*x)+0.44x+2.75=0

We add all the numbers together, and all the variables

-0.001(+x*x)+0.44x+2.75=0

We add all the numbers together, and all the variables

0.44x-0.001(+x*x)+2.75=0

We multiply parentheses

-0.001x^2+0.44x+2.75=0

a = -0.001; b = 0.44; c = +2.75;
Δ = b2-4ac
Δ = 0.442-4·(-0.001)·2.75
Δ = 0.2046
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{-(0.44)-\sqrt{0.2046}}{2*-0.001}=\frac{-0.44-\sqrt{0.2046}}{-0.002}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0.44)+\sqrt{0.2046}}{2*-0.001}=\frac{-0.44+\sqrt{0.2046}}{-0.002}
$