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# Domain and range

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-x^2-20x-3
What are the domain and range and x intercepts of the function. Approximate to two decimal places

##### Solution Summary

This shows how to find domain, range, and intercepts.

##### Solution Preview

f(x)=-x^2-20x-3.
Then a=-1<0, b=-20, c=-3.
(1) The domain of f is all real numbers.
(2) To find the range of f, we need to find its vertex.
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