Harris Pritchard
02/14/2024 · Senior High School

\( \operatorname { im } _ { \rightarrow 9 } ( \frac { x - 9 } { \sqrt { x } - 3 } ) \)

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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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