Soal dan Pembahasan USBN
SMA
Tahun 2018
Matematika IPA
Kunci Jawaban USBN Matematika IPA Tahun 2018
26. Persamaan garis singgung kurva y = x2 - 2x + 3 yang sejajar dengan garis y = 4x -1 adalah ...
a. y = x + 4
b. y = 2x - 4
c. y = 4x - 2
d. y = 4x - 6
e. y = 4x + 6
Jawaban : D
sejajar dengan garis y = 4x -1
m = 4
karena sejajar, maka gradien garis singgung = 4
y ' = 2x - 2
m = y '
4 = 2x - 2
2x = 6
x = 3
y = x2 - 2x + 3
y = 32 - 2 . 3 + 3
y = 9 - 6 + 3
y = 6
x1, y1 = (3,6)
persamaan garis singgung :
y - y1 = m (x - x1)
y - 6 = 4 (x - 3)
y = 4x - 12 + 6
y = 4x - 6
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