Question

Fungsi f didefinisikan dngan rumus f(x) = a x -1. jika f(2) =7, bayangan dari x = -2 adalah...

Answer 1

F(x) = ax -1
f(2) = a(2) -1 = 7
       = 2a -1 = 7
       = 2a = 7 +1
       = 2a = 8
       = a = 8/2
       = a = 4

f(x) = 4x -1
f(-2) = 4(-2) -1
       = -8 -1
       = -9

Itu jawabannya.

Answer 2

F(x) = ax - 1

f(2) = 7
2a - 1 = 7
2a = 8
a = 4

f(-2) = -2 . 4 - 1
       = -8 - 1
       = -9