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Substitusi nilai x = a kedalam g(x), maka :
=> g(x) = 3x² - 16
=> g(a) = 3a² - 16
=> 32 = 3a² - 16
=> 3a² - 48 = 0
=> 3(a² - 16) = 0
=> 3(a + 4)(a - 4) = 0
Maka nilai a yaitu: a₁ = 4 dan a₂ = -4
Semoga membantu