Please solve the c and d sections of Q15 down
below. It’s urgent. The answers to the questions are below the question. I need the solutions for the questions in great detail. I
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Please Solve The C And D Sections Of Q15 Down Below It S Urgent The Answers To The Questions Are Below The Question I 1 (100.39 KiB) Viewed 20 times
Q15. Let f(x) = x² - 18x². (a) Find the domain of f, and, find x-intercepts and y-intercepts of the graph of f. (Ans.: Domain: (-∞, ∞), Intercepts: (0,0), (-3√(2),0) and (3√(2), 0)) (b) Find the critical values of f. Determine intervals on which the function f is increasing and intervals on which the function is decreasing. Determine relative extrema (maximum and minimum) of f, if any. (Ans.: CVs: x = 0, x = −3 and x = 3, Increasing: (-3,0) and (3, ∞), Decreasing: (-∞, -3) and (0, 3), Rel. max. at: x = 0, Rel. min. at: x = -3 and x = 3) (c) Determine intervals on which the function f is concave up and intervals on which the function is concave down. Find the inflection points, if any. (Ans.: Concave down: (-√3, √√3), Concave up: (-∞, -√3) and (√√3, ∞), Inflection Points at: x = -√3 and x = √3) (d) Sketch the graph of f including intercepts, relative extrema and inflection points.
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