14.
grafik terbuka ke bawah, maka a < 0
sumbu simetri di sebelah kanan sumbu y, karena a < 0, maka b > 0
memotong sumbu y positif, maka c > 0
Jawaban C
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15.
f(x) = x² + 6x + 7
f(x) = x² + 6x + 9 - 9 + 7
f(x) = (x² + 6x + 9) - 9 + 7
f(x) = (x + 3)² - 2
Jawaban D
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16.
f(x) = x² + 4x - 1
a = 1
b = 4
c = -1
D = b² - 4ac
D = 4² - 4(1)(-1)
D = 16 + 4
D = 20
Nilai minimum
= -D/4a
= -20/4(1)
= -20/4
= -5
Jawaban A
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14.
grafik terbuka ke bawah, maka a < 0
sumbu simetri di sebelah kanan sumbu y, karena a < 0, maka b > 0
memotong sumbu y positif, maka c > 0
Jawaban C
_________________________
15.
f(x) = x² + 6x + 7
f(x) = x² + 6x + 9 - 9 + 7
f(x) = (x² + 6x + 9) - 9 + 7
f(x) = (x + 3)² - 2
Jawaban D
__________________________
16.
f(x) = x² + 4x - 1
a = 1
b = 4
c = -1
D = b² - 4ac
D = 4² - 4(1)(-1)
D = 16 + 4
D = 20
Nilai minimum
= -D/4a
= -20/4(1)
= -20/4
= -5
Jawaban A