Algebra II : Quadratic Functions
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Example Questions
Example Question #13 : Transformations Of Parabolic Functions
Which would be the equation of 
To flip this over the 
This entails changing 
Perhaps a simpler way to think about this is that the vertex for this parabola is at 
If we flip the equation over the y-axis, it will place the vertex at 
Example Question #14 : Transformations Of Parabolic Functions
Write the equation for the parabola 
To solve this problem, we could complete the square and shift the equation that way, but the vertex ends up being 
To simplify, first expand
Now we can plug that in and continue simplifying:
Now we want to flip this over the x-axis, meaning that the y coordinates change sign.
This means we have to multiply everything by -1, or simply change the sign of every term on the right side:
Example Question #41 : Parabolic Functions
Describe the translation in
from the parent function
Up three units, left one unit
Up three units, right one unit
Down three units, right one unit
Down three units, left one unit
Down three units, right one unit
Below is the standard equation for parabolas;
Therefore,
thus,
the translation from the parent function is down three units, right one unit.
Example Question #14 : Transformations Of Parabolic Functions
Given the parabola 
Shifting up and down will result in a change in the y-intercept.
Add four to the equation.
Shifting the parabola to the left two units will change the inner term 
Replace the 
The new equation is:
Example Question #15 : Transformations Of Parabolic Functions
Shift 
Vertical shifts will change the value of the y-intercept. Since this function is to be shifted up two units, add two to the right side of the equation.
This graph shifted two units to the left indicates that its zeros will also shift to the left two units, which means that the 
Rewrite the equation and expand the binomials.
The new equation is:
Example Question #16 : Transformations Of Parabolic Functions
Shift the parabola 
Shifting this graph three units to the right means that the x-variable will need to be replaced with 
Use the FOIL method to simplify the binomial.
Simplify the right side.
The equation becomes:
The answer is:
Example Question #42 : Parabolic Functions
3 spaces right
3 spaces up
3 spaces down
3 spaces left
3 spaces right
Example Question #43 : Parabolic Functions
Which of the below quadratic functions will be the widest?
To determine how "wide" or "skinny" a parabola is, we look at the leading coefficient.
The smaller the fraction, the wider a parabola will be.
The larger the whole number, the skinnier the parabola will be.
This will give us the widest parabola.
Example Question #44 : Parabolic Functions
Shift 
Simplify the following equation by using the FOIL method with the binomial.
Simplify all terms in the parentheses.
Replace the term and simplify.
The equation in standard form is:
Since this parabola is shifted up one unit, add one to the y-intercept.
The answer is:
Example Question #45 : Quadratic Functions
Write the equation for the parabola 
First, reflect the equation over the y-axis by switching the sign of x:
Now shift up 2 by adding 2:
Now shift left 4 by adding 4 to x:
Now multiply
Now plug those back in:
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