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.

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.

anonymous · Answer

domain is a kind of input..and the range is the output for the input

anonymous · Answer

for the above euation consider the domain as real nos

anonymous · Answer

which gives you the values x then substitute each domain in the equation to get range

anonymous · Answer

@patrica

anonymous · Answer

hi srry i was afk can u help me finish this question?