Q=r+4/r-4

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Solution for Q=r+4/r-4 equation: 



=Q+4/Q-4

We move all terms to the left:

-(Q+4/Q-4)=0



Domain of the equation: Q-4)!=0

Q∈R



We get rid of parentheses

-Q-4/Q+4=0

We multiply all the terms by the denominator


-Q*Q+4*Q-4=0

We add all the numbers together, and all the variables

4Q-Q*Q-4=0

Wy multiply elements

-1Q^2+4Q-4=0

a = -1; b = 4; c = -4;
Δ = b2-4ac
Δ = 42-4·(-1)·(-4)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$Q=\frac{-b}{2a}=\frac{-4}{-2}=+2$

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