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bayangan 2 adalah 0
nilai a adalah -1
Dit : f (-3) = ...?
f (2) = ...?
f (a) = 9 ; a = ..?
Jwb: f (-3) = -3. (-3) + 6 f (2) = -3 . (2) + 6
= 9 + 6 = -6 + 6
= 15 = 0
f (a) = -9
-3. a + 6 = -9
-3. a = -15
a = 5