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memotong sumbu x di 2 titik : D > 0
b^2 - 4ac > 0
=> (3 - 2a)^2 - 4(a)(a - 4) > 0
=> 9 - 12a + 4a^2 - 4a^2 + 16a > 0
=> 9 + 4a > 0
=> 4a > -9
=> a > -9/4