Fungsi kuadrat y = 3x² + 3x -18 memotong sumbu x di titik
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Memotong sumbu x ------> y = 0
y = 3x² + 3x - 18
0 = 3( x² + x - 6 )
0 = 3( x + 3 ) ( x - 2 )
x + 3 = 0 atau x - 2 = 0
x = -3 atau x = 2
Koordinat = ( -3, 0 ), ( 2, 0 )
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