1.

(4a-5b)^3 expand the following​

Answer»

Answer: (4A-5B)^3

= (4a)^3-(5b)^3-(3×4a×5b)(4a-5b)

= 64a^3-125b^3-60ab(4a-5b)

=64a^3-125b^3-240a^2+300ab^2

By using the identity,

(x-y)^3 = x^3-y^3-3xy(x-y)



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