In Exercises 1-4, use a graphing utility to graph the equation. Use the graph to approximate the values of x that satisfy each inequality.
Equation
1. y = −x2 + 2x + 3
Inequalities
a. y ≤ 0
b. y ≥ 3
2. y = 1/2x2 - 2x + 1
a. y ≤ 0
b. y ≥ 7
3. y = 1/8x3 - 1/2x
a. y ≥ 0
b. y ≤ 0
4. y = x3 - x2 -16x + 16
a. y ≤ 0
b. y ≥ 36