A quadratic function f is given. f(x) = x² + 8x + 15 (a) Express fin standard form. (b) Find the vertex and x- and y-intercepts of f. (If an answer does not exist, enter DNE.) (x, y) = vertex x-intercepts (x, y) = (x, y) = y-intercept (x, y) = (c) Sketch a graph of f. (smaller x-value) (larger x-value)

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