5x(5x-8)=-16

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Solution for 5x(5x-8)=-16 equation: 



5x(5x-8)=-16

We move all terms to the left:

5x(5x-8)-(-16)=0

We add all the numbers together, and all the variables

5x(5x-8)+16=0

We multiply parentheses

25x^2-40x+16=0

a = 25; b = -40; c = +16;
Δ = b2-4ac
Δ = -402-4·25·16
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{40}{50}=4/5$

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