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144x^2+168x+49=0
a = 144; b = 168; c = +49;
Δ = b2-4ac
Δ = 1682-4·144·49
Δ = 0
Delta is equal to zero, so there is only one solution to the equation
Stosujemy wzór:$x=\frac{-b}{2a}=\frac{-168}{288}=-7/12$
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