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Q. 28

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Found in: Page 876

### Precalculus Enhanced with Graphing Utilities

Book edition 6th
Author(s) Sullivan
Pages 1200 pages
ISBN 9780321795465

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# Graph each function. Use the graph to find the indicated limit, if it exists.$\underset{x\to 4}{\mathrm{lim}}f\left(x\right),f\left(x\right)=3\sqrt{x}$

The limit is $6$.

See the step by step solution

## Step 1. Given Information

We are given a function $f\left(x\right)=3\sqrt{x}$ and we need to graph the function and find $\underset{x\to 4}{\mathrm{lim}}f\left(x\right)$.

## Step 2. Plotting the graph

So, the graph of the function $f\left(x\right)=3\sqrt{x}$ is

## Step 3. Finding the limit

To find the value of $\underset{x\to 4}{\mathrm{lim}}f\left(x\right)$ we need to find the value of the function at $x=4$.

$f\left(x\right)=3\sqrt{x}\phantom{\rule{0ex}{0ex}}⇒f\left(4\right)=3\sqrt{4}\phantom{\rule{0ex}{0ex}}⇒f\left(4\right)=6\phantom{\rule{0ex}{0ex}}\therefore \underset{x\to -1}{\mathrm{lim}}f\left(x\right)=6$

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