jika f(x)=9x+(a+6) dan f(1)=16,tentukan nilai a dan f(2)

Bab Fungsi
Matematika SMP Kelas VIII

f(x) = 9x + (a + 6)

f(1) = 9 . 1 + (a + 6) = 16
          9 + a + 6 = 16
          a = 16 - 15
          a = 1

f(x) = 9x + 1 + 6
      = 9x + 7

f(2) = 9 . 2 + 7
      = 18 + 7
      = 25

f(x) = 9x+(a+6)
f(1)= 9(1) +(a+6)=16
9 + (a+6) =16
a = 16-9-6
a=1

f(2)=9(2)+(1+6)
=18+7
=25