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Polynomials — MATHS STD 9 — Question

Rajasthan BoardEnglish MediumSTD 9MATHSPolynomials1 Mark
Question
Find the products using appropriate identities: $(x + 3) (x + 3)$
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Answer

We have the Identity: $(x + y)^2$
$= x^2 + 2xy + y^2.$
Put $y = 3$ in it,
we get $(x + 3) (x + 3) $
$= (x + 3)^2 $
$= x^2 + 2(x)(3) + (3)^2 $
$= x^2 + 6x + 9$

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