2.5x^2=5.5x-2.3

Solution for 2.5x^2=5.5x-2.3 equation:

2.5x^2=5.5x-2.3

We move all terms to the left:

2.5x^2-(5.5x-2.3)=0

We get rid of parentheses

2.5x^2-5.5x+2.3=0

a = 2.5; b = -5.5; c = +2.3;
Δ = b2-4ac
Δ = -5.52-4·2.5·2.3
Δ = 7.25
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{-(-5.5)-\sqrt{7.25}}{2*2.5}=\frac{5.5-\sqrt{7.25}}{5}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-5.5)+\sqrt{7.25}}{2*2.5}=\frac{5.5+\sqrt{7.25}}{5}
$