Latihan Kompetensi Siswa 2
Kelas XI
SMA Kelas XI
Buku Sukino Kelompok Wajib
Kunci Jawaban Matematika Buku Sukino Kelas XI Kelompok Wajib
A.
6. Persamaan garis singgung kurva y = 2x2 - 1/x di titik yang berabsis 1 adalah ...
a. y = 4x - 3
b. y = - 5x + 6
c. y = 5x - 4
d. y = - 3x + 4
e. y = 3x - 2
Jawaban : C
y = 2x2 - 1/x
di titik absis 1, artinya x = 1. Cari nilai y
y = 2x2 - 1/x
y = 2(1)2 - 1/(1)
y = 2 - 1
y = 1
titik singgung (1,1)
cari gradien :
y = 2x2 - 1/x
y' = 4x + 1/x2
masukkan nilai x dari titik singgung
m = 4 (1) + 1/(1)2
m = 4 + 1
m = 5
persamaan garis singgung :
y - y1 = m (x - x1)
y - 1 = 5 (x - 1)
y - 1 = 5x - 5
y = 5x - 4
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