For each of the following polynomials:

• x2 - 4
• -x3 -3x2
• 2x2 +5x-3

1. Input the polynomial into the input box and press the left-hand Enter key (Not the one on the number pad). Using the graph, determine the x-values where the polynomial is positive, negative, and zero. (Use the xmin and xmax sliders to change the boundaries of the graph if needed.)
2. Indicate these x-values on the number lines below. Use a + (plus sign) to indicate where the polynomial is positive, a - (minus sign) to indicate where it is negative, and a closed dot where it is zero.