y^2-8y+36=20

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Solution for y^2-8y+36=20 equation: 



y^2-8y+36=20

We move all terms to the left:

y^2-8y+36-(20)=0

We add all the numbers together, and all the variables

y^2-8y+16=0

a = 1; b = -8; c = +16;
Δ = b2-4ac
Δ = -82-4·1·16
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$y=\frac{-b}{2a}=\frac{8}{2}=4$

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