Day2 Quadratic Formulanotes.notebook
January 22, 2015
Solving a quadratic equation with square root method.
ex1
x = 9 4 x
ex2
2 5(x ­ 4) = 20
1
Day2 Quadratic Formulanotes.notebook
January 22, 2015
2
Day2 Quadratic Formulanotes.notebook
ex3
­4x2 + 35 = ­1
January 22, 2015
ex4
3 = 2 2
x 10
3
Day2 Quadratic Formulanotes.notebook
January 22, 2015
ex5
2 (x ­ 5) = 144
4
Day2 Quadratic Formulanotes.notebook
0 = x2 + 7x + 10
January 22, 2015
Notice this quadratic equation has a linear term­­
New method to solve.
Quadratic Formula ­b ±√b2-4ac
2a
5
Day2 Quadratic Formulanotes.notebook
January 22, 2015
2 4x + 32x = 0 Quadratic Formula ­b ±√b2-4ac
2a
6
Day2 Quadratic Formulanotes.notebook
3 = x+5 2x ­ 4
January 22, 2015
Quadratic Formula ­b ±√b2-4ac
2a
7
Day2 Quadratic Formulanotes.notebook
January 22, 2015
2x2 ­ 12x ­ 20 = ­ 2x + 8
Quadratic Formula ­b ±√b2-4ac
2a
8
Day2 Quadratic Formulanotes.notebook
January 22, 2015
Quick Quiz
Use the quadratic formula to solve for x
1.
2. 3.
0 = x2 ­ 4x ­ 21
­8 = 4x x+2 5
Quadratic Formula ­b ±√b2-4ac
2a
5x2 ­ 7x ­ 31 = x2 ­ 2x ­ 3
9