A=(X-1)(1-x)

Solution for A=(X-1)(1-x) equation:

=(A-1)(1-A)

We move all terms to the left:

-((A-1)(1-A))=0

We add all the numbers together, and all the variables

-((A-1)(-1A+1))=0

We multiply parentheses ..

-((-1A^2+A+A-1))=0


We calculate terms in parentheses: -((-1A^2+A+A-1)), so:

(-1A^2+A+A-1)

We get rid of parentheses

-1A^2+A+A-1

We add all the numbers together, and all the variables

-1A^2+2A-1

Back to the equation:

-(-1A^2+2A-1)


We get rid of parentheses

1A^2-2A+1=0

We add all the numbers together, and all the variables

A^2-2A+1=0

a = 1; b = -2; c = +1;
Δ = b2-4ac
Δ = -22-4·1·1
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{2}{2}=1$