Solving quadratic inequalities

1. Day 9 ­ Solving quadratic inequalities
2
Solve for x using your calc: 4x ­ 9 > 0
1

2. Solving quadratic inequalities algebraically:
1. Solve just like an equality.
2. Plot the solutions on a number line.
3. Take test points in each interval.
4. Fill in the interval(s) that "work".
5. Write the solution using interval notation.
2

3. Solve: 2x2 ­ 6x < 5x ­ 5 Solving quadratic inequalities:
1. Solve just like an equality.
2. Plot the solutions on a number line.
3. Take test points in each interval.
4. Fill in the interval(s) that "work".
5. Write the solution using interval notation.
3

4. 2
Solve: 9x ­ 2 > ­3x
2 2
2x + 4x < x ­ x ­ 6
2
x + x > 8 ­ x
4