(x-9)(x)=2x-5x-8

Solution for (x-9)(x)=2x-5x-8 equation:

(x-9)(x)=2x-5x-8

We move all terms to the left:

(x-9)(x)-(2x-5x-8)=0

We add all the numbers together, and all the variables

(x-9)x-(-3x-8)=0

We multiply parentheses

x^2-9x-(-3x-8)=0

We get rid of parentheses

x^2-9x+3x+8=0

We add all the numbers together, and all the variables

x^2-6x+8=0

a = 1; b = -6; c = +8;
Δ = b2-4ac
Δ = -62-4·1·8
Δ = 4
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{4}=2$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-6)-2}{2*1}=\frac{4}{2}
=2
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-6)+2}{2*1}=\frac{8}{2}
=4
$