/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 27 Sketch the graph of the function... [FREE SOLUTION] | 91Ó°ÊÓ

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Sketch the graph of the function using the approach presented in this section. $$f(x)=x \sqrt{1-x}$$

Short Answer

Expert verified
The graph of \(f(x) = x \sqrt{1-x}\) starts at the point (0,0), extends to the left without limit, and approaches but does not cross the vertical line \(x=1\) from the left.

Step by step solution

01

Identify the domain

The domain of a function is the set of all possible x-values. To determine the domain of \(f(x)=x \sqrt{1-x}\), we need to spot two constraints: the square root quantity must be positive or zero, which implies \(1-x \geq 0\) or \(x \leq 1\), also the function \(f(x)\) includes the term \(x\), it exists for all \(x\) in the real numbers. Thus, combining both conditions, the domain is \(x \leq 1\).
02

Identify the intercepts

To determine the x-intercept, we set \(f(x) = 0\), which means \(x \sqrt{1-x} = 0\). This implies \(x = 0\) thus (0,0) is the x-intercept. For the y-intercept, we evaluate the function at \(x = 0\), we then have \(f(0) = 0\), thereby (0,0) is also the y-intercept.
03

Check for symmetry

For even function, \(f(x) = f(-x)\), the graph is symmetric about the y-axis. For odd function, \(f(x) = -f(-x)\), the graph is symmetric about the origin. Substituting -x into our function doesn’t yield the same function or the negation of the function. Therefore, it’s neither, the function doesn’t have symmetry.
04

Determine Extremes and Calculate End Behavior

Since this is not a polynomial function, we can't compute the edges using conventional calculus techniques (like finding the derivative and setting it to zero to find local minima/maxima). Instead, we should remember the domain of the function: for \(x \leq 1\). At the right-hand end of this interval, \(f(x)\) approaches 0 as \(x\) approaches 1.
05

Sketch the graph

Combine all the above points to sketch the graph. The graph begins at the origin (0,0) and extends to the left without bound. As it moves to the right, it reaches a maximum before descending and approaching to the vertical line \(x=1\) from the left and never crossing the line.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Domain of a Function
Understanding the domain of a function is like knowing the playing field for x-values where the function can 'come to life'. For the given function, \(f(x)=x \sqrt{1-x}\), it’s crucial to grasp where it’s defined. We must pay attention to the 'no-no' zone for square roots, which is that you can’t have negative numbers under that square root sign. This restriction tells us that \(1-x \geq 0\), leading to \(x \leq 1\). This part keeps the square root happy.
Another aspect to consider is the simplicity of \(x\) itself. Since \(x\) can be any real number, there’s no restriction from this term. This might seem contradictory, but it’s like having two filters that all x-values must pass through to be part of the domain; hence, x must satisfy both conditions. The coolest takeaway here is that the domain is all real numbers up to, but not exceeding 1. Simple, right?
A tip for students: when you sketch the graph, this domain tells you where to draw the line (or the curve, to be precise). The function won't exist to the right of \(x=1\)—it's an end-of-the-road sign!
X-intercepts and Y-intercepts
Diving into the intercepts, the x-intercept is where the function kisses the x-axis and the y-intercept is its peck on the y-axis. It’s like a game of hide and seek, but for numbers. We find the x-intercept by setting our function equal to zero—because where else would you be on the y-axis if not at zero? So, we get \(x \sqrt{1-x} = 0\) which gives us \(x = 0\). Hello, x-intercept at (0,0)!
For the y-intercept, it’s as if our x took a day off, so we set \(x = 0\) in our function and get \(f(0) = 0\). So, the y-intercept is chilling at the same spot, (0,0). It’s a two-for-one special—both intercepts are taking a nap at the origin. Remember, looking for intercepts is like hunting for clues on where your graph will pass through those axes, so always keep your eyes peeled!
Symmetry in Functions
When it comes to symmetry, it's all about balance and mirror images. There are two main types: y-axis symmetry and origin symmetry. A function with y-axis symmetry means that if the graph had a mirror along the y-axis, both sides would match perfectly. That's an even function, with the fancy test of \(f(x) = f(-x)\).
On the flip side, if a function spins around like a dancer and lands in the same spot when you flip both signs—voila, you have origin symmetry. That's an odd function for you, where \(f(x) = -f(-x)\). But for our function \(f(x)=x \sqrt{1-x}\), substituting \(-x\) into it doesn't pass either test—it's not a mirror dancer, nor does it spin right. This lack of symmetry keeps the graph from being overly predictable and adds a bit of spice to our graphing adventure.
End Behavior of Functions
The end behavior of a function is like a spoiler alert for how a graph 'ends' as x-values head off towards infinity (or negative infinity). With our function, \(f(x)=x \sqrt{1-x}\), we've got some non-polynomial action which means no 'infinity-reaching' arrows. Thanks to our domain, we already knew that our x-values couldn't strut beyond 1, so the function has an endpoint there.
As x snuggles up to 1 from the left side, the function gives us a gentle nudge towards 0. No dramatic spikes or plummets—just a mellow approach to the line \(x=1\) without ever crossing it. This tells us that as x goes on its journey to 1, the graph settles down peacefully. Always keep in mind that the end behavior gives the grand finale of your function's graph—the final piece of the puzzle that lets you complete the picture.

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Most popular questions from this chapter

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