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Andrewww
 3 years ago
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.
Andrewww
 3 years ago
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.

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gandalfwiz
 3 years ago
Best ResponseYou've already chosen the best response.4The domain is all the possible x values that exist in the graph. On the graph x^2 +4x21, no matter which x value you choose, there is a corresponding y value. Even if your x is infinity, negative infinity, or zero, the parabola exists there, so your domain is "all real numbers."

Andrewww
 3 years ago
Best ResponseYou've already chosen the best response.0thank you so so so much but i need the range too

gandalfwiz
 3 years ago
Best ResponseYou've already chosen the best response.4The range is all the possible y values. In the above said parabola, the highest is ever reaches is 17. The graph just doesn't exist higher than that. So the range is "all real numbers less than or equal to 17."

gandalfwiz
 3 years ago
Best ResponseYou've already chosen the best response.4*highest it ever reaches*, sorry
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