Question

23. Write in expanded form:

a) (2x + 3y)3 b) (3x-2y)3 c) (7a+5b)3

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Answer 1

Answer:

a. 6x+9y

b. 9x-6y

C. 21a+15b

Answer 2

(2x+3y)^3

= (2x)^3+(3y)^3+3(2x)(3y)(2x+3y)

= 8x^3+27y^3+18xy(2x+3y)

= 8x^3+27y^3+36x^2(y)+54xy^2