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2. Polynomials
easy
નીચેના વિસ્તરણ કરો :
$(3 a-2 b)^{3}$
Option A
Option B
Option C
Option D
Solution
We have,
$(3 a-2 b)^{3}=(3 a)^{3}-(2 b)^{3}-3(3 a)(2 b)(3 a-2 b)$
$\left[\because(a-b)^{3}=a^{3}-b^{3}-3 a b(a-b)\right]$
$=27 a^{3}-8 b^{3}-18 a b(3 a-2 b)$
$=27 a^{3}-8 b^{3}-54 a^{2} b+36 a b^{2}$
Standard 9
Mathematics
