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Identities — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSIdentities4 Marks
Question
Expand : $(a+b−c)^2$
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Answer

$(a+b−c)^2 $
$= (a)^2 + (b)^2 +(−c)^2 + 2 \times a \times b + 2 \times b \times (−c) + 2 \times (−c) \times (a)$
$= a^2 + b^2 + c^2 + 2ab − 2bc − 2ca$

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