Question 1194665
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Look at your textbook,  first.



Alternatively,  look at the lesson at this site 


&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/The-cube-of-a-sum-formula.lesson>The cube of the sum formula</A> 




If your wish to see many sources exceeds two sources, &nbsp;you may extend your search to these sources


https://www.math-only-math.com/expansion-of-a-plus-minus-b-whole-cube.html#:~:text=We%20will%20discuss%20here%20about,(a%20%C2%B1%20b)3.&text=%3D%20a3%20%2B%203a2b,%2B%203ab2%20%2B%20b3.&text=%3D%20a3%20%2D%203a2b,%2B%203ab2%20%2D%20b3.


https://www.mathway.com/popular-problems/Algebra/202987


https://byjus.com/questions/expand-a-b-3/


https://ncalculators.com/algebra/a-b-n-formula-expansion.htm



Happy learning (!)