Day 1 Notes Solving Quadratics COMPLETED.notebook
Solving Quadratics: f(x) = ax2 + bx + c
February 06, 2015
quadratics have solutions they are the xintercepts
Methods: 1. Square Root Method 2. Factoring 3. Quadratic Formula 4. Completing the Square (tomorrow)
two solutions
one solution
no real solution
solutions can also be called xintercepts zeros roots
1. Square Root Method ⇒ isolate the x2 ⇒ take the square root of both sides Examples: 1) x2 = 25
2) x2 = 81
3) x2 = 96
4) x2 = 12
5) 12x2 60 = 0
6) 3x2 48 = 0
1
Day 1 Notes Solving Quadratics COMPLETED.notebook
2. Solve by Factoring
February 06, 2015
a. x2 + 6x + 9 = 0
b. x2 + 2x = 35
c. z2 = 9
d. 2x2 6x = 36
e. 4x2 28x + 49 = 0
f. 5x2 + 4x 3 = 0
Steps: 1. Set = 0
2. Factor
3. Set each factor with a variable = 0 using the Zero Product Property
4. Solve for each solution
2
Day 1 Notes Solving Quadratics COMPLETED.notebook
February 06, 2015
Use the discriminant to determine the number of solutions. Then solve by using the quadratic formula: a. x212x = 28
b. x2+22x+121
c. 2x2+4x5=0
d. x2 4x = 13
3. Quadratic Formula
Form ax2 + bx + c = 0 (must be set = to zero!!!!) Use to solve any quadratic x =
a ≠ 0 b2-4ac is called the discriminant if b24ac > 0 then two real solutions b24ac = 0 then one real solution b24ac < 0 then two imaginary solutions
d. x2 4x = 13
b. x2+22x+121=0
3
Day 1 Notes Solving Quadratics COMPLETED.notebook
February 06, 2015
Problem #1 on Homework. Follow same procedure as the ones that have only an xsquared. First, get the squared part alone. Then take square
root. Then add/subt the other number to the other side to finish solving.
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