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f(a) = - 3
- 3 = - 2a² + 5
2a² = 8
a² = 4
a = 2 atau a = - 2
f(a) = -3
-2a^2+5 = -3
-2a^2 = -8
2a^2 = 8
a^2= 4
a = 2