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f(1)= a(1)+b= 17
f(-1)= a(-1)+b= -1
a+b=17
-a+b=-1
2a=18
a= 9
a+b=17
9+b=17
b=17-9
b=8
f(1) = 7→a.1+b=7
f(-1)=-1→a.-1+b=-1 _
2a = 8
a =8/2
a = 4
b = 7-a
= 7-4
= 3
jadi nilai a nya adalah 4 dan nilai b nya adalah 3