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Di sb. X :
y = 0
x^2 - 4x -6 = 0
x = (-b ± √(b^2-4ac)) / 2a
x = (4 ± √(16 - 4(1)(-6))) / 2(1)
x = (4 ± √(40)) / 2
Di sb. Y :
x = 0
-y^2 + 6y -6 = 0
*Cari nilai y-nya, sama seperti step sebelumnya.