Matematika 13. Jika fungsi f(x) = ax - b, dengan nilai f(2)= 8, dan f(6) = 28, maka nilai f(-2) adalah...?a. -12b. -8c. -2d. 5​

tremaynemckenzieulv – March 13, 2023

13. Jika fungsi f(x) = ax - b, dengan nilai f(2)= 8, dan f(6) = 28, maka nilai f(-2) adalah...?
a. -12
b. -8
c. -2
d. 5​

Jawab:

f(2)= 8

f(6) = 28

f(x) = ax - b

f(2) = 2a - b = 8

f(6) = 6a - b = 28

6a - b = 28

2a - b = 8

__________ -

4a = 20

a = 5

2a - b = 8

2(5) - b = 8

10 - b = 8

10 - 8 = b

b = 2

f(-2) = 5x - 2

       = 5(-2) - 2

       = -10 - 2

       = -12

[answer.2.content]