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= 9m^2 - 4n^2
b. 15 + 3a - 5a - a^2
= 15 - 2a - a^2
c. 2a^2 - 4a + 2 + a^3 - 2a^2 + a
= a^3 + 2a^2 -2a^2 - 4a + a + 2
= a^3 - 3a + 2
terima kasih