Question

what is the formula of a plus b whole cube

Answer 1

(a+b)³ = a³ +3a²b+ 3ab² +b³
hope it helps you

Answer 2

$\textbf{Answer}$

We need to find the formula of (a+b)^3

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

=> (a+b)^3 = {(a+b)(a+b)} (a+b)

=> (a+b)^3 = {(a+b)^2} (a+b)

We know that,
$\textbf{(a+b)^2 = a^2 + b^2 + 2ab}$

=> (a+b)^3 = {a^2 + b^2 + 2ab} (a+b)

=> (a+b)^3 = a^3 + ab^2 + 2a^2b + a^2b + b^3 + 2ab^2

=> (a+b)^3 = a^3 + b^3 + 3a^2b + 3ab^2

=> (a+b)^3 = a^3 + b^3 + 3ab(a+b)

Hence the formula of (a+b)^3 is,

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


$\textbf{Hope It Helps}$

$\textbf{Thanks}$