Question

Fungsi h dinyatakan dengan rumus h(x) =
px + q. Jika h(4) = -28 dan h(-5) = 26, maka h(-12)=...

Answer 1

H(x) = px + q

h(4) = 4p + q = -28
h(-5) = -5p + q = 26
-------------------------- -
9p = - 54
p = - 6

4p + q = - 28
- 24 + 28 = q
4 = q

maka p = - 6 dan q = 4

h(-12) = (-6) . (-12) + 4 = 72 + 4 = 76
 

Answer 2

H(x) = px + q

h(4) = -28
4p + q = -28.......... persamaan 1

h(-5) = 26
-5p + q = 26.......... persamaan 2

jika,
4p + q = - 28
q = -28 -4p
maka substitusikan ke persamaan ke 2
-5p + q = 26
-5p +(-28-4p) = 26
-5p - 28 -4p = 26
-9p = 26 + 28
-9p = 54
p = 54/ -9 = -6
q = -28-4p = -28 -4(-6) = -28 + 24 = -4
maka didapat

h(x) = px + q
h(x) = -6x -4

h(-12) = -6(-12) -4 = 72 -4 = 68