a.

To expand , you can use the formula for the square of a binomial: . Here, and . So, .

Now, let’s think about where you might use this! In the world of algebra, expanding binomials like this not only preps you for graphing quadratic equations but also helps in simplifying expressions for calculus later on. It’s like building the foundation of a house; you need a strong base to add the delicious toppings of advanced math!