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Bayangan -2 oleh fungsi tersebut adalah -4, berarti:
f(-2) = -4
f(-2) = 3(-2) + c
-4 = -6 + c
c = 6 - 4
c = 2
Maka, fungsi tersebut menjadi:
f(x) = 3x + 2
f(a) = 5
f(a) = 3a + 2
5 = 3a + 2
3a = 5 - 2
3a = 3
a = 3 : 3
a = 1