3. Jika f(x) = 2x *kuadrat* + 1 maka f(x+1) 4. Jika g(x) = 2x *kuadrat* - 1 maka g (x-1)

f(x) = 2x² + 1
f(x+1) = 2(x+1)² + 1
= 2(x² + 2x + 1) + 1
= 2x² + 4x + 2 + 1
= 2x² + 4x + 3

g(x) = 2x² - 1
g(x-1) = 2(x-1)² - 1
= 2(x² - 2x + 1) - 1
= 2x² - 4x + 2 - 1
= 2x² - 4x + 1

semoga membantu ^^