1. jika f(x) = ax+b, f(1)=2, dan f(2)=1 maka tentukan. a. bentuk fungsi f(x) b. bentuk paling sederhana dari f(x-1) c. bentuk paling sederhana dari f(x)+f(x-1)
please bantu ya,,, pake caranya juga....
ekamiaww
F(x) = ax+b f(1) = 2 --> a+b = 2 f(2) = 1 --> 2a+b = 1 _ -a = 1 a = -1 a+(-1) = 2 a = 3 a) f(x) = 3x-1 b) f(x-1) = 3(x-1)-1 = 3x-3-1 = 3x-4 c) f(x) + f(x-1) = 3x-1 + 3x-4 = 6x-5
f(1) = 2 --> a+b = 2
f(2) = 1 --> 2a+b = 1 _
-a = 1
a = -1
a+(-1) = 2
a = 3
a) f(x) = 3x-1
b) f(x-1) = 3(x-1)-1
= 3x-3-1
= 3x-4
c) f(x) + f(x-1) = 3x-1 + 3x-4
= 6x-5
semoga membantu :)
2a + b = 1
________ -
- a = 1
a = - 1
b = 3
Rumus fungsi
f(x) = - x + 3
b) f(x - 1) = - (x - 1) + 3 = - x + 4
c) f(x) + f(x - 1) = (- x + 3) + (- x + 4)
= - 2x + 7