A=3.14*(x+2)(x+2)

Solution for A=3.14*(x+2)(x+2) equation:

=3.14(A+2)(A+2)

We move all terms to the left:

-(3.14(A+2)(A+2))=0

We multiply parentheses ..

-(3.14(+A^2+2A+2A+4))=0


We calculate terms in parentheses: -(3.14(+A^2+2A+2A+4)), so:

3.14(+A^2+2A+2A+4)

We multiply parentheses

3.14A^2+6.28A+6.28A+12.56

We add all the numbers together, and all the variables

3.14A^2+12.56A+12.56

Back to the equation:

-(3.14A^2+12.56A+12.56)


We get rid of parentheses

-3.14A^2-12.56A-12.56=0

a = -3.14; b = -12.56; c = -12.56;
Δ = b2-4ac
Δ = -12.562-4·(-3.14)·(-12.56)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{12.56}{-6.28}=-2$