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= (9a-2d+1) (9a)
= 81a^2-18ad+9a
b. (-1/2a)^2 (8a^2 + 12ab - 4b^2)
= 1/4a (64a + 12ab - 16b)
= 16a + 3ab - 4ab
smoga membantu dan benar
lau bener jdiin jawaban terbaik dong,gi butuh !!!