0=3.5x^2+21x+31.5

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Solution for 0=3.5x^2+21x+31.5 equation: 



0=3.5x^2+21x+31.5

We move all terms to the left:

0-(3.5x^2+21x+31.5)=0

We add all the numbers together, and all the variables

-(3.5x^2+21x+31.5)=0

We get rid of parentheses

-3.5x^2-21x-31.5=0

a = -3.5; b = -21; c = -31.5;
Δ = b2-4ac
Δ = -212-4·(-3.5)·(-31.5)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$x=\frac{-b}{2a}=\frac{21}{-7}=-3$

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