Question

Jika f(x)=ax+b,f(1)=2dan f(-1)=8 tentukanlah

A. rumus fungsi f
b. Nilai f(-5)

Answer 1

F(1) = a + b = 2 f(1) : a + b = 2
f(-1) = -a + b= 8 f(-1) : -a + b = 6
-a = - 6 b = 8
a = 6

jadi f(x) = 6x + 8

f(-5) = 6.-5 + 8
= -30 +8
= -22

maaf klo salah