-7r^2+70r-175=0

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Solution for -7r^2+70r-175=0 equation: 



-7r^2+70r-175=0

a = -7; b = 70; c = -175;
Δ = b2-4ac
Δ = 702-4·(-7)·(-175)
Δ = 0
Delta is equal to zero, so there is only one solution to the equation

                              Stosujemy wzór:
$r=\frac{-b}{2a}=\frac{-70}{-14}=+5$

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