Contoh Soal UTS PTS Matematika Kelas 9 Semester 1 Bagian 2 Full Pembahasan Kunci Jawaban Lengkap

Kunci Jawaban

11. a

x = 3
3^2 + 4.3 + c = 0
9 + 12 + c = 0
c = -21

12. a

D = b^2 - 4ac
49 = (-5)^2 - 4.3.c
49 = 25 - 12c
12c = 25 - 49
12c = -24
c = -24/12
c = -2

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13. b

x = 3
x^2 + 2x - 15 = 0
3^2 + 2.3 - 15 = 0
9 + 6 - 15 = 0

x^2 + 2x - 15 = 0
(x + 5)(x - 3) = 0

x + 5 = 0
x = -5