Question

PLEASE HELP
Your friend, Patricia, is having a hard time understanding the concept behind the domain and range of a parabola. Using complete sentences, explain the meaning of the domain and range of the graph of y = −x2 + 4x − 21 and how to find both. Keep in mind, your goal is to help Patricia understand the "concepts", not just how to use the steps.

Answer 1

Any ideas?

Answer 2

domain of a variable: The given set of numbers that the variable may represent.

Answer 3

graph your given equation

Answer 4

domain is all of the x values valid for your function, in this case it is all real numbers
you can also, use your table values to verify this

Answer 5

Range is all of the y values that are valid for your function