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
Share
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