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AnilSinghBora
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Write the following cubes in expanded form: (i) (2x+1)3 Q.6(1)

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What is the best way for solving the question from Polynomials chapter of exercise 2.5 of ncert class 9th math, how i solve this question in simple and easy way i think it is very important for class 9th Write the following cubes in expanded form: (i) (2x+1)3

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  1. Using identity,(x+y)3 = x3+y3+3xy(x+y)

    (2x+1)3= (2x)3+13+(3×2x×1)(2x+1)

    = 8x3+1+6x(2x+1)

    = 8x3+12x2+6x+1

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