Asked by dian
find the domain of the given function
f(x)=square root 9-x
f(x)=square root 9-x
Answers
Answered by
Steve
You know that sqrt(u) has domain u>=0. In this case, u = 9-x. So, yu must have
9-x >= 0
9 >= x
or, as usually written
x <= 9
or
{x:x<=9}
or
x in (-oo,9]
depending on desired notation.
9-x >= 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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