-1 e 3
x² - 2x -3 = 0........fatorando:
(x-3) .(x+1) = 0
x'=3....x''=-1
ou:
x² - 2x -3 = 0
D=b²-4.a.c = (-2)² -4.1.(-3)= 4+12=16.......=> VD=4
x'= -b+VD/2a = 2+4/2 = 6/2 = 3
x''= -b-VD/2a = 2-4/2 = -2/2 = -1
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Answers & Comments
-1 e 3
x² - 2x -3 = 0........fatorando:
(x-3) .(x+1) = 0
x'=3....x''=-1
ou:
x² - 2x -3 = 0
D=b²-4.a.c = (-2)² -4.1.(-3)= 4+12=16.......=> VD=4
x'= -b+VD/2a = 2+4/2 = 6/2 = 3
x''= -b-VD/2a = 2-4/2 = -2/2 = -1