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y = 2x^2 - x - 3
0 = 2x^2 - x - 3
(2x-3) ( x+1) =0
x=3/2 atau x=-1
(3/2,0), ( -1,0)
maka nilai y = 0
y = 2x² - x - 3
0 = 2x² - x - 3
0 = ( 2x - 3) ( x+ 1)
x = 3/2 V x = -1