x(5-x)=-4

Solution for x(5-x)=-4 equation:

x(5-x)=-4

We move all terms to the left:

x(5-x)-(-4)=0

We add all the numbers together, and all the variables

x(-1x+5)-(-4)=0

We add all the numbers together, and all the variables

x(-1x+5)+4=0

We multiply parentheses

-1x^2+5x+4=0

a = -1; b = 5; c = +4;
Δ = b2-4ac
Δ = 52-4·(-1)·4
Δ = 41
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)-\sqrt{41}}{2*-1}=\frac{-5-\sqrt{41}}{-2}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(5)+\sqrt{41}}{2*-1}=\frac{-5+\sqrt{41}}{-2}
$