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Substitusi x = 3 + h kedalam f(x), maka :
=> f(3 + h) = (3 + h) - (3 + h)²
=> f(3 + h) = 3 + h - 9 - 6h - h²
=> f(3 + h) = -h² - 5h - 6
=> f(3 + h) = h² + 5h + 6 (Hasil sampai sini, namun jika perlu lanjutkan kebawah)
Jika ditanyakan nilai h dan hasilnya, maka faktorkan saja :
=> h² + 5h + 6
=> (h + 2)(h + 3), maka h₁ = -2 dan h₂ = -3
Jika h = -2, maka: f(1) = 0
Jika h = -3, maka: f(-1) = 0
Semoga membantu