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7r(2)-14r=-7
We move all terms to the left:
7r(2)-14r-(-7)=0
We add all the numbers together, and all the variables
7r^2-14r+7=0
a = 7; b = -14; c = +7;
Δ = b2-4ac
Δ = -142-4·7·7
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$r=\frac{-b}{2a}=\frac{14}{14}=1$
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