Question

Dirumuskan f (x) = ax + b.jika nilai f(-2) =14 dan nilai f(3) = -1 maka nilai a - 2b =

Answer 1

Cara cepat nihh
f(-2) = 14
f(3) = -1 (dikurangi)
 a = -5 , 15
 a = -3

b = 14 - (-2 x -3) = 14 - 6 = 8

a- 2b = -3 - 2(8) = -3 - 16 = -19

Answer 2

F(x) = ax + b
f(-2) = 14
f(3) = -1

f(-2) = -2a + b = 14
f(3) = 3a + b = -1
------------------------- -
-5a = 15
a = -3

f(3) = 3(-3) + b = -1
-9 + b = -1
b = 8

a-2b = -3 -2(8) = -19