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2.3 Analyzing Graphs of Functions
A. Vertical Line Test (again)B. Domain and Range from a Graph
C. Zeros of a FunctionD. Intervals where Increasing, Decreasing, or Constant
A. Remember vertical line test?
• Here it is again:
B. Domain and Range from a Graph
• Break out the CRAYONS! Or just pretend.• For the DOMAIN of a graph, imagine a big
sunshine over and below it, casting a SHADOW onto the x-axis.
• The domain is usually written in interval notation.
State the domain in interval notation
Now for the Range (shadow on the y-axis)
Find the domain and range:
Find the domain and range:
C. If you’re asked to “find the zeros of the function,” it just means replace “f(x)” with zero and solve. Like
these:
5
32)(
10)(
103)(
2
2
t
tth
xxg
xxxf
D. Finding intervals where increasing, decreasing, or constant.
• “INCREASING” = “uphill from left to right”• “DECREASING” = “downhill from left to right”• “CONSTANT” = “horizontal”• “INCREASING” = positive slope• “DECREASING” = negative slope• “CONSTANT” = zero slope
ALL THESE INTERVALS ARE OPEN!
• WHEN ASKED TO FIND INTERVALS WHERE DECREASING,
INCREASING, CONSTANT, USE OPEN INTERVALS!
• ROUND BRACKETS, NOT SQUARE ONES.
State intervals where increasing, decreasing, or constant:
State intervals where increasing, decreasing, or constant:
State intervals where increasing, decreasing, or constant:
State intervals where increasing, decreasing, or constant: