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f(5a + 2) = 3(5a + 2) - 4
= 15a + 6 - 4
= 15a + 2
Jadi nilai f(5a + 2) adalah 15a + 2 (D).
f(5a + 2)= 3(5a + 2) - 4
f(5a + 2)= 15a + 6 - 4
f(5a + 2)= 15a + 2
jawabannya D