Use the function f(x) to answer the questions: f(x)=4x^2-7x-15 Part A: what are the x-intercepts of the graph of f(x)? Show your work(2 points) Part b: Is the vertex of the graph of f(x) going to be maximum or minimum? What are the coordinates of the vertex? Justify your answer and show your work (3 points) Part c what are the steps you would use to graph f(x)? Justify that you can use the answer obtained in part a and part b to draw the graph. (5 points)