Diketahui rumus fungsi jika f(1) =4 dan f(3) = 14 maka nilai f(-2) adalah..

F(1) = a + b = 4
f(3) = 3a + b = 14

-2a = -10
a = 5

5 + b = 4
b = -1

f(-2) = -2a + b
f(-2) = -10 -1 = -11

F(1)=4
F(3)=14
F(-2) = 6
a=4
b=5
F(-2)=a+b(-2)
=4+5(-2)
=4-10
=-6