2. Polynomials
easy

निम्नलिखित घनों को प्रसारित रूप में लिखिए

$(2 x+1)^{3}$

Option A
Option B
Option C
Option D

Solution

Using Identity $VI$ and Identity $VII,$ we have

$(x+y)^{3}=x^{3}+y^{3}+3 x y(x+y),$ and $(x-y)^{3}=x^{3}-y^{3}-3 x y(x-y)$

$(2 x+1)^{3}=(2 x)^{3}+(1)^{3}+3(2 x)(1)[(2 x)+(1)]$                [Using Identity $VI$]

$=8 x ^{3}+1+6 x [2 x +1] $

$=8 x ^{3}+1+12 x ^{2}+6 x =8 x ^{3}+12 x ^{2}+6 x +1$

Standard 9
Mathematics

Similar Questions

Start a Free Trial Now

Confusing about what to choose? Our team will schedule a demo shortly.