A quadratic function f is given. f(x) = x2 + 8x + 7 (a) Express f in vertex form. f(x) = Correct: Your answer is correct. (b) Find the vertex and x- and y-intercepts of f. (If an answer does not exist, enter DNE.) vertex (x, y) = Correct: Your answer is correct. x-intercept (smaller x-value) (x, y) = Correct: Your answer is correct. x-intercept (larger x-value) (x, y) = Correct: Your answer is correct. y-intercept (x, y) = Correct: Your answer is correct. (c) Sketch a graph of f. Selection Tool Line Ray Segment Circle Vertical Parabola Horizontal Parabola Point No Solution Help -10-9-8-7-6-5-4-3-2-112345678910-12-11-10-9-8-7-6-5-4-3-2-1123456789101112 Clear Graph Delete Layer Fill WebAssign Graphing Tool Graph LayersToggle Open/Closed Point 1 Remove This Layer Point 2 Remove This Layer Point 3 Remove This Layer Point 4 Remove This Layer Submission Data Incorrect: Your answer is incorrect. (d) Find the domain and range of f. (Enter your answers using interval notation.) domain range