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# Algebra 2 Lesson 3-9

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### Algebra 2 Lesson 3-9

1. 1. Day 9 ­ Solving quadratic inequalities 2  Solve for x using your calc:   4x ­ 9 > 0 1
2. 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. 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. 4. 2 Solve: 9x  ­ 2 > ­3x  2  2 2x + 4x < x  ­ x ­ 6 2  x + x > 8 ­ x 4