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=> f (3x + 8 )
=> 6 (3x + 8 ) kuadrat + 7(3x + 8) - 25
=> 6 ( 9x + 48x + 64 ) + 21x + 56 - 25
=> 54x + 288x + 384 + 21x + 56 - 25
=> 363x + 415
b. = 363 (1) + 415
= 778
maaf kalau salah, coba di koreksi lagi