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= (a + 3)(a + 3 - 2)
= (a + 3)(a + 1)
= a² + 4a + 3
smgmbntu ya
f(a+3) = (a+3)^2 - 2(a+3)
= {a^2 + (a.3.2) + 3^2} - { (2.a) + (2.3)}
= (a^2 + 6a + 9 } - (2a + 6)
= a^2 + 6a + 9 - 2a - 6
= a^2 + 6a - 2a + 9 - 6
= a^2 + 4a - 3
kalau tidak salah, semoga membantu