November 28, 2016
Warm up: Solve
2
x -3x-10 = 0
`
November 28, 2016
True or False?
i) If
a b = 0,
then a=0 or b=0
ii) If
a b > 0,
then a>0 or b>0
November 28, 2016
4.9 Solving Quadratic Inequalities
Solve the quadratic inequality
i) Find critical numbers.
(Numbers that make equation = 0 )
ii) Plot critical numbers on a number line.
iii) Test within each region
iv) Write answer in interval notation
1) x2-3x-10 > 0
November 28, 2016
Solve and write answers in interval notation.
2
2) 2x +9x<5
November 28, 2016
2
3) x +3x<0
November 28, 2016
Homework: pg. 304 #26-28, 32-34 all
Write your answer in interval notation.