Find a possible equation for the common logarithmic function graphed in
[link] .
This graph has a vertical asymptote at
and has been vertically reflected. We do not know yet the vertical shift or the vertical stretch. We know so far that the equation will have form:
It appears the graph passes through the points
and
Substituting
Is it possible to tell the domain and range and describe the end behavior of a function just by looking at the graph?
Yes, if we know the function is a general logarithmic function. For example, look at the graph in
[link] . The graph approaches
(or thereabouts) more and more closely, so
is, or is very close to, the vertical asymptote. It approaches from the right, so the domain is all points to the right,
The range, as with all general logarithmic functions, is all real numbers. And we can see the end behavior because the graph goes down as it goes left and up as it goes right. The end behavior is that as
and as
Access these online resources for additional instruction and practice with graphing logarithms.
When the parent function
is multiplied by
the result is a reflection about the
x -axis. When the input is multiplied by
the result is a reflection about the
y -axis.
The equation
represents a reflection of the parent function about the
x- axis.
The equation
represents a reflection of the parent function about the
y- axis.
t he silly nut company makes two mixtures of nuts: mixture a and mixture b. a pound of mixture a contains 12 oz of peanuts, 3 oz of almonds and 1 oz of cashews and sells for $4. a pound of mixture b contains 12 oz of peanuts, 2 oz of almonds and 2 oz of cashews and sells for $5. the company has 1080
Lairene and Mae are joking that their combined ages equal Sam’s age. If Lairene is twice Mae’s age and Sam is 69 yrs old, what are Lairene’s and Mae’s ages?