A=(x+7)*(x+7)

Solution for A=(x+7)*(x+7) equation:

=(A+7)(A+7)

We move all terms to the left:

-((A+7)(A+7))=0

We multiply parentheses ..

-((+A^2+7A+7A+49))=0


We calculate terms in parentheses: -((+A^2+7A+7A+49)), so:

(+A^2+7A+7A+49)

We get rid of parentheses

A^2+7A+7A+49

We add all the numbers together, and all the variables

A^2+14A+49

Back to the equation:

-(A^2+14A+49)


We get rid of parentheses

-A^2-14A-49=0

We add all the numbers together, and all the variables

-1A^2-14A-49=0

a = -1; b = -14; c = -49;
Δ = b2-4ac
Δ = -142-4·(-1)·(-49)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$A=\frac{-b}{2a}=\frac{14}{-2}=-7$