Question

(4a + 5b) (4a + 5b )
(4a + 5b)

Answer 1

(4a+5b)(4a+5b)(4a+5b)

=(4a+5b)^3

(4a)^3+(5b)^3+3(4a)^2(5b)+3(4a)(5b)^2

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

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