Question

Fungsi f ditentukan dengan rumus f (x) = ax+b. Bila f(2) = -4 dan f(-1) = 2, maka nilai a^-b =

Answer 1

F(x) = ax + b

2a + b = -4
-a + b = 2 (dieliminasi)

a = 2 b = 0

a^-b
2^0 = 1

Answer 2

F(x) = ax +b
f(2) = a(2) +b = -4
     = 2a +b = -4
f(-1) = a(-1) +b = 2
       = -a +b = 2

2a +b = -4
-a +b = 2    -
    3a = 0
    3a = -6
      a = -2

2a +b = -4
2(-2) +b = -4
-4 +b = -4
b = -4 +4
b = 0

Maka, nilai :
a -b
= -2 -(0)
= -2 -0
= -2

Itu jawabannya.