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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

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##### Solution Summary

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

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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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