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Jawab19.
kurva melalui (0,0) dan (2,4),(-2,4), terbuka keatas
maka y = x²
20.
f(x) = x² -2x - 3
pembuat nol ---> f(x)= 0
x² - 2x - 3= 0
(x -3)(x +1)= 0
x = 3 atau x = - 1
(x,y) = (-1,0) dan (3,0)