12. Use the Binomial Theorem to expand the expression (3x² +4y)³. Show your work. 13. Write the expression below in the form (a + b)" 92 1296x¹² - 4320x³y² + 5400x'y' - 3000x³y + 625y8 14. Suppose you are expanding (5x-2y)³. a) How many terms are there in the expansion? b)State the degree of each term. c) Find the middle term

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