y(y+8)-16(y-1)=0

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Solution for y(y+8)-16(y-1)=0 equation: 



y(y+8)-16(y-1)=0

We multiply parentheses

y^2+8y-16y+16=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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