(0.089-x)(0.089-x)=0

Solution for (0.089-x)(0.089-x)=0 equation:

(0.089-x)(0.089-x)=0

We add all the numbers together, and all the variables

(-1x+0.089)(-1x+0.089)=0

We multiply parentheses ..

(+x^2-0.089x-0.089x+0.007921)=0

We get rid of parentheses

x^2-0.089x-0.089x+0.007921=0

We add all the numbers together, and all the variables

x^2-0.178x+0.007921=0

a = 1; b = -0.178; c = +0.007921;
Δ = b2-4ac
Δ = -0.1782-4·1·0.007921
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{0.178}{2}=0.178/2$