what is the cube of a+b

Question

⟨a+b⟩³

Answer 1

a³ +3a²b + 3ab² + b³ which is good to MEMORIZE. 

 

You will be able to work it out by doing polynomial multiplication:

(a+b)(a+b)² = (a+b)(a²+2ab+b²).

 

Later in your Algebra career, you will learn about Pascal's Triangle which is the key to expanding

(a+b)ⁿ out to all of its n+1 terms