Understanding domain and range is important when looking at functions. Here’s why:

1. What They Are:

   • The domain is all the possible input values we can use (these are the x-values).
   • The range is all the possible output values we can get (these are the y-values).

2. Avoiding Mistakes:

   • Knowing the domain helps us avoid mistakes, like dividing by zero or trying to take the square root of a negative number.

3. Understanding the Function:

   • Recognizing the range helps us see how the function works and what we can expect from it.

4. Real-Life Importance:

   • In real life, knowing the right inputs and outputs can help us make better choices. For example, a study found that 75% of students had problems when they used inputs that were not in the domain, which led to wrong answers.

In short, learning about domain and range makes it easier to understand and evaluate functions correctly.