Question

1. Jika f(x) = 2x -a, tentukan nilai a, f(2) = 6
2. Jika f(x) = 3x -1, tentukan nilai a jika f(a) = 8


Help!

Answer 1

1) f(x) = 2x - a
f(2) = 6
2(2) - a = 6
4 - a = 6
a = - 2

2) f(x) = 3x - 1
f(a) = 8
3a - 1 = 8
3a = 9
a = 3

Answer 2

1. f(x) = 2x - a, f(2) = 6
   penyelesaian:
   f(2) =
   6 = 2.2 - a
   6 = 4 - a
  6-4 = a
  2 = a, jadi a = 2
2. f(x) = 3x - 1, f(a) = 8
   penyelesaian:
   f(a) =
   8 = 3.a - 1
  8+1 = 3.a
   9 = 3.a
   = a
   3 = a, jadi a = 3