Clicking on the check boxes you can see the parts of graph where f(x) is positive (negative) and the corresponding values of x on the x-axis. [br]You can also see the intersections of the function with the x-axis

Identify on the graph the intervals where the given functions given are [br]positive/negative. Then click on the check boxes to chech your answer. [br][br]1. f(x) = -x² + 2x + 3; [br][br]2. f(x) = -x³ - x² + 2x;[br][br]3. f(x) = x³ - 6x² + 5x + 12; [br][br]4. f(x) = x² + x + 1[br][br]5. f(x) = x⁴ + 1.5x³ - 2x² - 1.5x + 1[br][br]6. f(x) = 2x⁶ + x⁵ - 13.5x⁴ - 6.25x³ + 24.25x² + 9x - 9