7. Graph
a) What is the y-intercept?
b) What are the x-intercepts?
c) What are the coordinates of the vertex?
a) The y-intercept is the point where the graph crosses the y axis.
Its x-coordinate is 0. If we set x = 0 in our equation we get
b) The x-intercept is the point where the graph crosses the x axis.
Its y-coordinate is 0. If we set y = 0 in our equation we get
We need to solve for x
Factor
Set the factors = 0
Solve for x
c) To find the coordinates of the vertex, we first transform the
equation into vertex form.
Add and subtract the square of half of 6.
Simplify
To get the coordinates of the vertex:
Change the sign on the number inside the parentheses to get the x-
coordinate
Don't change the sign on the number outside the parentheses to get
the y-coordinate.
The vertex is at (3, -4)
Plot these points and the graph will look like:
