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f(3) = 3a + b = 9
-6a = -24
a = 4
b = -3
f(12) + f(2)
= -2a + b + 2a + b
= 2b = -6
f(-3)=-3a+b=-15
f(3) = 3a+b= 9
----------------- -
-6a = -24
a= 4
3a +b = 9
3(4)+b=9
12+b=9
b=9-12
b = -3
f(-2)=ax +b. f(2)=4(2)+(-3)
= 4(-2)+(-3) = 8+(-3)
=-8+(-3) =-11. = 5
jadi nilai f(-2)+f(2) = -11+5
= -6