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=(3a.4a) + (3a.{-5b}) + (2b.4a) + (2b.{-5b})
= 12a² - 15ab + 8ab - 10b²
=12a² - 7ab - 10b²
semoga membantuu
= [3a.(4a-5b)]-[2b.(4a-5b)]
= 12a²-15ab - 8ab+10b²
= 12a²-23ab+10b²