Question

(a+b) (a-b-c) =

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Answer 1

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➨ (ᴀ + ʙ) ( ᴀ - ʙ - ᴄ)

$➨ {a}^{2} { - ab} \: - ac \: + ab \: - \: {b}^{2} - bc$

$➨ {a}^{2} - ac - bc - {b}^{2}$

Answer 2

Answer:

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Step-by-step explanation:

$(a+b) (a-b-c) \\ \\ a(a-b-c) + b (a-b-c) \\ \\ a {}^{2} - ab - ac + ab - b {}^{2} - bc \\ \\ a {}^{2} \: \: \cancel{- ab} - ac \: \: \cancel{+ ab} - b {}^{2} - bc \\ \\ a {}^{2} - b {}^{2} - ac - bc\\\\a {}^{2} - b {}^{2} -c(a+b)$