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= (3a)^5 + 5(3a)^4(2b) + 10(3a)^3(2b)^2 + 10(3a)^2(2b)^3 + 5(3a)(2b)^4 + (2b)^5
= 243a^5 + 810a^4b + 1080a^3b^2 + 720a^2b^3 + 240ab^4 + 32b^5
2) (4x + 5y)(3x + 2y -1)
= 12x^2 + 8xy - 4x + 15xy + 10y^2 - 5y
= 12x^2 + 10y^2 + 23xy - 4x - 5y