Question

Jika tentukan nilai dari b/a

Answer 1

f(1) = 0
a(1)^3 - 10(1)^2 + b(1) - 2 = 0
a - 10 + b - 2 = 0
a + b - 12 = 0
a + b = 12.....(1)

f(2) = 0
a(2)^3 - 10(2)^2 + b(2) - 2 = 0
8a - 40 + 2b - 2 = 0
8a + 2b - 42 = 0
8a + 2b = 42
4a + b = 21....(2)

Eliminasikan (1) dan (2)
4a + b = 21
a + b = 12
- - - Kurangi - - -
3a = 9
a = 3

Lalu,
a + b = 12
3 + b = 12
b = 9

Sehingga
b/a = 9/3
b/a = 3