5x(5x+18)=-81

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Solution for 5x(5x+18)=-81 equation: 



5x(5x+18)=-81

We move all terms to the left:

5x(5x+18)-(-81)=0

We add all the numbers together, and all the variables

5x(5x+18)+81=0

We multiply parentheses

25x^2+90x+81=0

a = 25; b = 90; c = +81;
Δ = b2-4ac
Δ = 902-4·25·81
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{-90}{50}=-1+4/5$

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