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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.

Mathematics
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domain is a kind of input..and the range is the output for the input
for the above euation consider the domain as real nos
which gives you the values x then substitute each domain in the equation to get range

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Other answers:

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

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