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a. a. 3x² – 12 = 0
3x² – 12 = 0
Maka a = 3, b = 0, c = -12
Jadi Diskiriminan = 0² – 4(3)(–12) = 144
b. x² + 7x + 6 = 0
x² + 7x + 6 = 0
Maka a = 1, b = 7, c = 6
Jadi Diskiriminan = 7² – 4(1)(6) = 49 – 24 = 25
c. -3x² - 5x + 2 = 0
-3x² - 5x + 2 = 0
Maka a = -3, b = -5, c = 2
Jadi Diskiriminan = (–5)² – 4(–3)(2) = 25 + 24 = 49
Baca Juga: Kunci Jawaban Matematika Kelas 9 Halaman 84, Berdasarkan Hasil Pengamatan Menggambar Grafik
Soal nomor 6
3x² – 5x + c = 0
Maka a = 3, b = -5
Jika D = b² - 4ac, D = 49
49 = (-5)² - 4.3.c
49 - 25 = -12.c
-12.c = 24
c = - 24/12
c = - 2
Soal nomor 7
3x2 = 2x – 4
Maka 3x2 – 2x + 4 = 0
