Question

$(2a - {3b)}^{4}$

Answer 1

Heya!

$(2a-3b)^4 \\ \\ = (2a-3b)^2(2a-3b)^2 \\ \\ = 2(2a-3b)^2\\ \\= 2[(2a)^2 + (3b)^2 - 2(2a)3b)] \\ \\{--[Using: (a-b)^2 = a^2 + b^2 - 2ab]}\\ \\= 2[4a^2 + 9b^2 - 12ab] \\ \\= 8a^2 + 18b^2 - 24ab \\ \\.......that's \: the \: answer..........$

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