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x² - 1 = 0 4x² - 4x - 1 = 0 -3x² - 5x + 2 = 0
a=1, b=0, c=-1 a=4, b=-4, c=-1 a=-3, b=-5, c=2
D= 0² - 4.1.-1 D= 4² - 4.4.-1 D= -5² - 4.-3.2
= 0 + 4 = 16 + 16 = 25 + 24
= 4 = 32 = 49