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-x^2 + 7x -6 =0
delta=49 - 24=25
pierw. z delta= 5
x1=(-7-5)/-2=6
x2=(-7+5)/-2=1
a=-1 <0 , ramiona paraboli są skierowane w dół, więc :
x€ (-∞, 1> v < 6, +∞)