soal mtk cara cariknya

jawab

2x - 1 = 0
x  = 1/2
f(1/2)= 8

x+1 =0
x = -1
f(-1) = 17

sisa s(x)=  ax + b
nilai sisa = nilai fungsi
s(1/2)= f(1/2) →  1/2 a + b = 8
atau a + 2b = 16   .....(i)
s(-1) = f(-1) →  a + b = 17 .....(ii) 

(i) dan (ii)
a + 2b = 16
a  +  b = 17 ..||(-)
b = - 1
a = 18

s(x)= ax+b
s(x) = 18x - 1