Posted by dian on Sunday, September 25, 2011 at 10:13pm.
find the domain of the given function
f(x)=square root 9x

Pre calculus  Steve, Tuesday, September 27, 2011 at 6:17am
You know that sqrt(u) has domain u>=0. In this case, u = 9x. So, yu must have
9x >= 0
9 >= x
or, as usually written
x <= 9
or
{x:x<=9}
or
x in (oo,9]
depending on desired notation.
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