What binomial would you multiply by itself to get a²+2a+1?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

If i have one apple and give you the apple, how many apples do i have?

To convert celsius temperatures to fahrenheit, you can use the expression (c + 32). tom says that another way to write this expression is c + 32. what error did tom make?