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f(2) = a.2 + b = 8 → 2a+b = 8
f(-2) = a.(-2) + b = -4 → -2a+b = -4 _
4a = 12
a = 12
4
a = 3
b → 2a+b=8
2.3+b=8
6+b = 8
b = 8-6
b = 2
b.) Nilai 2a² + 3b = (2.3)² + 3.2 =6² + 6 = 36 + 6 = 42