Microsoft Word - Problem 3.docx

1. Use graphing approach to solve the inequality x^2+2x-8 > 0 :
   1. (a) Graph the function f(x)=x^2+2x-8 , find and label x-intercepts, shade thesolution set on the x-axis; Hint: f(x)=x^2-x-8=(x+1)^2-9;
   2. (b) Write down the solution set using an interval notation; compare your answer with the answer of other group members.
   3. (c) Which of the following numbers belong to the solution set? Does your result support or contradict with your answer to part (b)? -10, -5, -4, -2, 0, 1, 2, 3, 100
   4. (d) Write down the solution set to the inequality x^2+2x-8< or =0 .