Suppose that f(x) = x ^ 2 + 4x - 21 (a) What is the vertex of f? (b) What are the x-intercepts of the graph of f? (c) Solve f(x) = - 21 for x. What points are on the graph of f? (d) Use the information obtained in parts (a)- 1)-(c) to graph f(x) = x ^ 2 + 4x - 21

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