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melalui titik (-1, -1)
-1 = a(-1) + b/(-1)²
-1 = -a + b
-a + b = -1 ...........(1)
turunan fungsi = gradien garis singgung
y′ = a - 2bx⁻³
m = a - 2b/(-1)³
m = a + 2b
garis singgung sejajar dengan garis
4x - y + 65 = 0
y = 4x + 65.....gradien garis ini = 4
4 = a + 2b
a + 2b = = 4 .........(2)
Eliminasi (1) dan (2)
-a + b = -1
a + 2b = 4
----------------- +
...... 3b = 3
b = 1
a + 2b = 4
a + 2(1) = 4
a + 2 = 4
a = 2
jadi a = 2 dan b = 1