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Direction of OpeningY – interceptVertexAOSMin/Max ValueNumber of solutionsSolutionsDomain and RangeIncreasing Decreasing
QUIZ REVIEW
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QUIZ REVIEW
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On the Calculator:- Min/Max (Vertex)- AOS- Zeros
**Put equation in y1**Hit 2nd Trace**Follow directions on
Calculator
ON THE CALCULATOR
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September 26 th
PROPERTIES OF QUADRATIC
EQUATIONS - EQUATION
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y = ax2 + bx + ca ≠ 0
STANDARD FORM OF QUADRATIC EQUATIONS
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Let’s look at y = x2 and y = -x2:
Think-Pair-Share:What do you notice about these two graphs? What is the difference between the two equations? What do you think the difference means?
Parabola
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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Direction of opening: If a>0, the direction of opening is UP.
If a<0, the direction of opening is DOWN.
Example: y = 5x2 + 10x – 7
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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Graph the equation in you calculator:
y = x2 + 4x – 5
What is the y – intercept?
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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y – intercept:In standard form, c gives us the y-intercept:
y = ax2 + bx + c
Example: y = 5x2 + 10x – 7
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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1. y = -8x2 + 2x + 1
2. y = 6x2 – 24x - 4
WHAT IS THE DIRECTION OF OPENING AND Y – INTERCEPT OF
THE EQUATIONS?
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Axis of Symmetry (AOS): we can use the formula to find the AOS.
Example: y = -x2 + 8x + 16
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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Vertex: plug the AOS in for x and find the y value of the vertex.
Example: y = -x2 + 8x + 16
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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y = -8x2 + 2x + 1 y = 6x2 – 24x - 4
FIND THE AOS AND VERTEX
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Maximum/Minimum: highest/lowest point- If a < 0, the graph has a ______________- If a > 0, the graph has a ______________
The maximum/minimum value is the y – value of the vertex.
Example: y = -x2 + 8x + 16
WHAT DOES THE EQUATION OF A QUADRATIC FUNCTION
TELL US?
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1. y = x2 + 6x + 8Direction of Opening:y – intercept:AOS:Vertex:Max or Min Value:
PROPERTIES – PRACTICE USING THE EQUATION
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-x2 + 10x + 25 2x2 – 4x – 6 For the two quadratics answer these questions:
1. Direction of Opening?2. Y – intercept?3. AOS?4. Vertex?
WARM UP
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y = -2x2 + 12x + 16Direction of Opening:y – intercept:AOS:Vertex:Max or Min Value:Sketch the Graph:
PROPERTIES – REVIEW USING THE EQUATION
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y = 2x2 + 24x + 20Direction of Opening:y – intercept:AOS:Vertex:Max or Min Value:Sketch the Graph:
PROPERTIES – REVIEW USING THE EQUATION
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You and your partner will either have a picture of a graph or the equation of the graph. You should take a couple minutes to right down everything you know about
your graph/equation. Then when I say, walk around the room and find the pair
with the matching graph/equation.
Example: Matching Graph to Equation
ACTIVITY
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FLEX - FACTORING REVIEW
Factor the following expressions:1. x2 – 15x + 50: (x – 5)(x – 10)2. 12xy – 4y + 9x – 3: (4y + 3)(3x – 1)3. x2y - 3x2 – 8y - 24: (x2 – 8)(y – 3)4. x2 – 36: (x – 6)(x + 6)5. 20x2 – 16x: 4x(5x – 4)6. 4x2 - 24x + 36: 4(x – 3)(x – 3)7. 2x3 + 12x2 + 16x: 2x(x + 4)(x + 2)8. x2 - 5x - 14: (x – 7)(x + 2)9. 15ab – 5b + 9a – 3: (5b – 3)(3a – 1)
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Remember: factor the equation then set each set of parentheses equal to 0 and solve for x.
Example (solve by factoring): y = 3x2 + 2x – 5
ZEROS, ROOTS, X – INTERCEPTS, SOLUTIONS
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(x + 5)(x – 1) = 0
(2y – 1)(3y + 2) = 0
(3x – 3)(4x – 8) = 0
(7n – 14)(6n – 3) = 0
YOU TRY
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1. y = x2 - 10x - 11 2. y = -3x2 + 12
SOLVE BY FACTORING
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3. y = -2x2 + 6x + 56 4. y = 4x2 - 8x - 32
SOLVE BY FACTORING
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5. y = 3x2 – 9x 6. y = 3x2 + 4x – 4
SOLVE BY FACTORING
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Complete All Stations – Due at the end of class time!
STATIONS REVIEW
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Worksheet
HOMEWORK