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F(1)=a(1) + b = -2
F(4)=a(4) + b = 19
----------------------------- -
-3a = - 21
a = 7
f(1)= -2
f(4)= 19
f(1)= a(1) + b= -2 -----> a + b= -2
f(4)= a(4) + b= 19 -----> 4a + b= 19 _
-3a= -21
a= -21/-3
a= 7
a+ b= -2
7 + b= -2
b= -2 - 7
b= -9
Jadi, nilai a adalah 7.