Harris Pritchard
02/14/2024 · Senior High School
\( \operatorname { im } _ { \rightarrow 9 } ( \frac { x - 9 } { \sqrt { x } - 3 } ) \)
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Tutor-Verified Answer
Step-by-step Solution
To find the limit
\[
\lim_{x \to 9} \left( \frac{x - 9}{\sqrt{x} - 3} \right),
\]
we first substitute \( x = 9 \):
\[
\frac{9 - 9}{\sqrt{9} - 3} = \frac{0}{3 - 3} = \frac{0}{0},
\]
which is an indeterminate form. To resolve this, we can simplify the expression.
Notice that \( \sqrt{x} - 3 \) can be factored using the difference of squares. We can multiply the numerator and the denominator by \( \sqrt{x} + 3 \):
\[
\frac{x - 9}{\sqrt{x} - 3} \cdot \frac{\sqrt{x} + 3}{\sqrt{x} + 3} = \frac{(x - 9)(\sqrt{x} + 3)}{(\sqrt{x} - 3)(\sqrt{x} + 3)}.
\]
The denominator simplifies as follows:
\[
(\sqrt{x} - 3)(\sqrt{x} + 3) = x - 9.
\]
Thus, we have:
\[
\frac{(x - 9)(\sqrt{x} + 3)}{x - 9}.
\]
For \( x \neq 9 \), we can cancel \( x - 9 \):
\[
\sqrt{x} + 3.
\]
Now we can take the limit as \( x \) approaches 9:
\[
\lim_{x \to 9} (\sqrt{x} + 3) = \sqrt{9} + 3 = 3 + 3 = 6.
\]
Therefore, the limit is
\[
\boxed{6}.
\]
Quick Answer
The limit is 6.
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