z(4-1/2)=4

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Solution for z(4-1/2)=4 equation: 



z(4-1/2)=4

We move all terms to the left:

z(4-1/2)-(4)=0

We add all the numbers together, and all the variables

z(-1/2+4)-4=0

We multiply parentheses

-1z^2+4z-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:
$z=\frac{-b}{2a}=\frac{-4}{-2}=+2$

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