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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

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

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