Question

Fungsi g didefinisikan dengan rumus g(x)=qx+r.Nilai g(2)=-7 dan g(-5)=7.Nilai g(4) adalah

Answer 1

1) diket : g(x) = qx + r                 2) g(2) = 2.(-2) + r = -7 --> r = -7 + 4 = -3
g(2) = 2q + r = -7
g(-5) = -5q + r = 7
---------------------------- --
           7q      = -14
             q      = -2

3) g(4) = qx + r
          = (-2).4 + (-3) = -8 - 3 = -11

Answer 2

g(x) = qx + r

g(2) = -7
   -7 = 2q + r ... [ pers. 1 ]

g(-5) = 7
      7 = -5q + r ... [ pers. 2 ]

q = -2
 r = -3

g(4) = -2(4) - 3
g(4) = -8 - 3
g(4) = -11