(5.75-x)(5.75-x)=0

Solution for (5.75-x)(5.75-x)=0 equation:

(5.75-x)(5.75-x)=0

We add all the numbers together, and all the variables

(-1x+5.75)(-1x+5.75)=0

We multiply parentheses ..

(+x^2-5.75x-5.75x+33.0625)=0

We get rid of parentheses

x^2-5.75x-5.75x+33.0625=0

We add all the numbers together, and all the variables

x^2-11.5x+33.0625=0

a = 1; b = -11.5; c = +33.0625;
Δ = b2-4ac
Δ = -11.52-4·1·33.0625
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{11.5}{2}=5+1/1.3333333333333$