Latihan Kompetensi Siswa 2
Kelas XI
SMA Kelas XI
Buku Sukino Kelompok Wajib
Kunci Jawaban Matematika Buku Sukino Kelas XI Kelompok Wajib
A.
8. Persamaan garis normal dari kurva y = 1/x pada titik yang berabsis 2 adalah ...
a. x + 4y - 4 = 0
b. 4x -y + 4 = 0
c. 8x - 2y - 15 = 0
d. 2x + 8y - 15 = 0
e. 8x + 2y - 15 = 0
Jawaban : C
kurva :
y = 1/x
y = x-1
y' = - x-2
y' = - 1/x2
titik absis 2 (x = 2), cari nilai y
y = 1/x
y = 1/2
masukkan nilai x = 2 ke dalam fungsi turunan untuk mendapatkan gradien kurva :
y' = - 1/x2
m = - 1/4
m1 = - 1/4
gradien garis normal memenuhi persyaratan :
m1 . m2 = - 1
- 1/4 . m2 = - 1
m2 = 4
persamaan garis normal :
y - y1 = m2 (x - x1)
y - 1/2 = 4 (x - 2)
2y - 1 = 8x - 16
0 = 8x - 2y - 15
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