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f(-1) = a
a = 3(-1) + 10 = 7
f(b) = -2
3b + 10 = -2
3b = -12
b = -4
a + b = 7 - 4 = 3
Jawaban: A
f(2) = 3.-2 + 10 = -6 + 10 =4 jadi b=4
a+b = 7+4 = 11 C.