Question

Suatu fungsi f dinyatakan dengan rumus f(x) = ax + b, jika f(-5) =15 dan f(5) = -5. tentukan nilai f(2)

Answer 1

F(x)= ax + b
f(-5)= -5a + b = 15
f(5) = 5a + b = -5
_____________-
-10a = 20
a = -2

5a + b = -5
5(-2) + b = -5
-10 + b = -5
b = 5

f(x) = -2x + 5
f(2) = -2(2) + 5
f(2) = -4 + 5
f(2) = 1