2. Polynomials
medium

उपयुक्त सर्वसमिकाओं का उपयोग करके निम्नलिखित गुणनफल ज्ञात कीजिए

$(i)$ $(x+3)(x+3)$

$(ii)$ $(x-3)(x+5)$

Option A
Option B
Option C
Option D

Solution

$(i)$ Here we can use Identity $I :(x+y)^{2}=x^{2}+2 x y+y^{2} .$ Putting $y=3$ in it,

we get           $(x+3)(x+3)=(x+3)^{2}=x^{2}+2(x)(3)+(3)^{2}$

                        $=x^{2}+6 x+9$

$(ii)$ Using Identity $IV$ above, i.e., $(x+a)(x+b)=x^{2}+(a+b) x+a b,$ we have

$(x-3)(x+5) =x^{2}+(-3+5) x+(-3)(5)$

$=x^{2}+2 x-15$

Standard 9
Mathematics

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