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nilai f(a+3) = x pangkat2 -4x
= (a+3) pangkat2 - 4(a+3)
= (a kuadrat +3a +3a +9) - 4a - 12
= a kuadrat +6a +9 -4a -12
= a kuadrat +6a -4a +9-12
= a kuadrat +2a -3
sub kan ke
Maka:
"Semoga membantu"