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a(-1)^3 + 4(-1) + 1 = - 4
- a - 4 + 1 = - 4
- a - 3 = - 4
- a = - 1
a = 1
f(-1) = 4 --> a.(-1)³ + 4.(-1) + 1 = -4
-a - 4 + 1 = -4
-a = -4 + 4 - 1
-a = -1
a = 1
semoga membantu ya :)