Question

drive formula of( a+ b )^3 in step by step

Answer 1

(a+b)^3 can be written as (a+b)(a+b)(a+b)

first multiply(a+b)(a+b)
it us a^2 + b^2 + 2ab
now multiply by (a+b)
it comes a^3 + ab^2 + 2a^2b + a^2b +b^3 + 2ab^2

on adding the result is a^3 + b^3 + 3 ab^2 + 3 a^2b

Answer 2

$(a + b ) ^{3} = (a +b )( a+b )(a + b) \\ {a}^{3} + \: b ^{3} + 3 \: ab ( a+ b)$