Question

Fungsi f ditentukan oleh f(x) = ax+b . jika bayangan dr -3 adlh -15 dan bayangan dr 3 adlh 9, tentukan nilao dr f(-2)+f(2)

Answer 1

F(-3)=a(-3)+b
-15=-3a+b

f(3)=a(3)+b
9=3a+b

eliminasi
(-3a+b=15)-(3a+b=9)
-6a = -24
a = 4

substitusi
3a+b = 9
3(4)+b = 9
12+b = 9
b = -3

f(-2) = a(-2)+b
=4(-2) + (-3)
= -8-3
= -11

f(2)= a(2)+b
= 4(2)+(-3)
= 8-3
=5

jadi f(-2)+f(2) = -11+5 = -6