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25+70x+49x^2=0
a = 49; b = 70; c = +25;
Δ = b2-4ac
Δ = 702-4·49·25
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-70}{98}=-5/7$
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