10r-10r^2=2.5

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Solution for 10r-10r^2=2.5 equation: 



10r-10r^2=2.5

We move all terms to the left:

10r-10r^2-(2.5)=0

We add all the numbers together, and all the variables

-10r^2+10r-2.5=0

a = -10; b = 10; c = -2.5;
Δ = b2-4ac
Δ = 102-4·(-10)·(-2.5)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{-10}{-20}=1/2$

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