"Domain and Range"
(new lyrics by Lawrence Mark Lesser
may be sung to the traditional melody of "Home on the Range")
Sometimes an x makes no sense to be plugged into a
function:
We must steer clear of dividing by 0,
or taking even roots of negative numbers.
Chorus:
Doh, Domain and Range, we need to understand-
What can go in, what can come out are part
of a function's plan!
We won't deny there are values of y a function cannot
put out —
Like negatives from even roots or from absolutes,
or 0 from a fraction with nonzero top.
(Repeat chorus)
And there's no doubt we must leave out values
that can't happen:
So we'll ignore a bowling score beyond 0 and 300!
(Repeat chorus)