Question
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$(2b - b + c)^2$
$(2b - b + c)^2$
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Answer
$(2b - b + c)^2 = [(2a) + (-b) + (c)]^2$
$= (2a)^2 + (-b)^2 + (c)^2 + 2(2a)(-b) + 2(-b)(c) + 4(a)(c)$
$= 14a^2 + b^2 + c^2 - 4ab - 2bc + 4ac$
$= (2a)^2 + (-b)^2 + (c)^2 + 2(2a)(-b) + 2(-b)(c) + 4(a)(c)$
$= 14a^2 + b^2 + c^2 - 4ab - 2bc + 4ac$
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