Expand and simplify the following expression: (a-2b){3}

asked Sep 1, 2015 168k views

1 vote

Expand and simplify the following expression:
(a-2b){3}

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1 vote

$(x-y)^3=x^3-3x^2y+3xy^2-y^3\\--------------------------\\(a-2b)^3=a^3-3a^2\cdot2b+3a\cdot(2b)^2-(2b)^3\\\\=a^3-6a^2b+12ab^2-8b^3$

Automaton answered Sep 7, 2015

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