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3x^2 + 5x - 2 = 0
(3x -1)(x+2) = 0
3x-1 = 0
x = 1/3
atau
x+2 = 0
x = -2
memotong sumbu y, maka x = 0
y = 3x^2 + 5x -2
y = 0 + 0 -2
= -2