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Without graphing, determine the x-intercepts and vertex of the quadratic function f(x)=x²+11x+18. Show all of your work.

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Answer: https://www.khanacademy.org/math/algebra/x2f8bb11595b61c86:quadratic-functions-equations/x2f8bb11595b61c86:standard-form-quadratic/v/ex3-completing-the-square

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