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Polynomials — MATHS STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9MATHSPolynomials1 Mark
Question
Expand using appropriate identity: $(3a - 7b - c)^2$
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Answer

$(3a - 7b - c)^2= {3a + (- 7b) + (-c)}^2$
$= (3a)^2 + (-7b)^2 + (-c)^2 + 2(3a)(-7b) + 2(-7b)(-c) + 2(-c)(3a)$
$= 9a^2 + 49b^2 + c^2 - 42ab + 14bc - 6ca$

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