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[-/2 Points] DETAILS MY NOTES SPRECALC8 3.2.035.MI. Factor the polynomial and use the factored form to find the zeros. (Enter your answers as a comma-separated list. Enter all answers using the appropriate multiplicities.) \[ P=\square \text { ASK YOUR TEACHER } \] PRAC \( x=x^{4}-5 x^{3}+4 x^{2} \) Sketch the graph. \( y \)

Ask by George Elliott. in the United States
Feb 27,2025

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Answer

The zeros of the polynomial \( P(x) = x^4 - 5x^3 + 4x^2 \) are \( 0, 0, 1, 4 \).

Solution

To factor the polynomial \( P(x) = x^4 - 5x^3 + 4x^2 \) and find its zeros, we will follow these steps: 1. **Factor out the greatest common factor (GCF)**. 2. **Factor the remaining polynomial**. 3. **Find the zeros from the factored form**. 4. **Sketch the graph based on the zeros and their multiplicities**. ### Step 1: Factor out the GCF The GCF of the terms in \( P(x) \) is \( x^2 \). We can factor this out: \[ P(x) = x^2(x^2 - 5x + 4) \] ### Step 2: Factor the remaining polynomial Next, we need to factor the quadratic \( x^2 - 5x + 4 \). We can look for two numbers that multiply to \( 4 \) (the constant term) and add to \( -5 \) (the coefficient of \( x \)). The numbers \( -4 \) and \( -1 \) satisfy these conditions. Thus, we can factor the quadratic as follows: \[ x^2 - 5x + 4 = (x - 4)(x - 1) \] Putting it all together, we have: \[ P(x) = x^2(x - 4)(x - 1) \] ### Step 3: Find the zeros To find the zeros, we set \( P(x) = 0 \): \[ x^2(x - 4)(x - 1) = 0 \] This gives us the following equations: 1. \( x^2 = 0 \) → \( x = 0 \) (with multiplicity 2) 2. \( x - 4 = 0 \) → \( x = 4 \) (with multiplicity 1) 3. \( x - 1 = 0 \) → \( x = 1 \) (with multiplicity 1) Thus, the zeros of the polynomial are: \[ 0 \text{ (multiplicity 2)}, 1 \text{ (multiplicity 1)}, 4 \text{ (multiplicity 1)} \] ### Final Answer for Zeros The zeros, including their multiplicities, are: \[ 0, 0, 1, 4 \] ### Step 4: Sketch the graph To sketch the graph of \( P(x) \): - The zero at \( x = 0 \) has a multiplicity of 2, which means the graph will touch the x-axis at this point and turn around. - The zero at \( x = 1 \) has a multiplicity of 1, so the graph will cross the x-axis at this point. - The zero at \( x = 4 \) also has a multiplicity of 1, so the graph will cross the x-axis at this point as well. The general shape of the graph will start from positive infinity (as \( x \to -\infty \)), touch the x-axis at \( x = 0 \), cross at \( x = 1 \), and cross again at \( x = 4 \), eventually going to positive infinity (as \( x \to +\infty \)). This completes the solution. If you need a visual representation or further assistance, please let me know!

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The Deep Dive

To factor the polynomial \( P(x) = x^4 - 5x^3 + 4x^2 \), first, factor out the greatest common factor, which is \( x^2 \). This gives us \( P(x) = x^2(x^2 - 5x + 4) \). Now, we need to factor the quadratic \( x^2 - 5x + 4 \). This can be factored into \( (x-4)(x-1) \). Thus, the fully factored form of the polynomial is \( P(x) = x^2 (x - 4)(x - 1) \), and the zeros are \( x = 0 \) (multiplicity 2), \( x = 1 \) (multiplicity 1), and \( x = 4 \) (multiplicity 1). When sketching the graph, you'll want to plot these zeros on the x-axis. The zero at \( x = 0 \) will "bounce" because of its multiplicity of 2, meaning the graph touches the x-axis and turns around there. The zeros at \( x = 1 \) and \( x = 4 \) will cross the x-axis. Don't forget to check the behavior as \( x \to \pm \infty \); since the leading term is positive, the graph will rise on both ends!

Related Questions

1.3.2 Make a conjecture with regard to \( r^{n} \) and \( S_{n} \) as \( n \rightarrow \infty \) (2) 1.4 CASE 3: \( r=1 \) 1.4.1 What is the sum of the geometric series \[ S_{n}=a+a r+a r^{2}+\ldots a r^{n-1} \text { if } r=1 \text { ? } \] 1.4.2 Make a conjecture with regard to \( r^{n} \) and \( S_{n} \) as \( n \rightarrow \infty \) (2) 1.5 CASE 4: \( r=-1 \) 1.5.1 What is the sum of the geometric series \[ S_{n}=a+a r+a r^{2}+\ldots a r^{n-1} \text { if } r=-1 ? \] 1.5.2 Do the sums above approach some finite particular number as \( n \rightarrow \infty \) i.e. is the sequence divergent or convergent? 1.6 CASE 5: \( -1<r<1 \) REQUIREMENTS: - One A4 papers - Provided grid 1.6.1 Write THREE possible values of \( r \) such that \( -1<r<1 \). 1.6.2 Step 1. Cut the A4 size paper along the longest side into two equal Rectangles and define their areas to be 16 unit \( ^{2} \). 1.6.3 Step 2. Place one half of the rectangle in Step 1 on the desktop and cut the other half along the longest side in to two equal rectangles. 1.6.4 Step 3. Place one half of the rectangle in Step 2 on the desktop and cut the other half along the longest side into two equal rectangles. 1.6.5 Step 4. Continue with the procedures from Step 3 until you find it too difficult to fold and cut the piece of paper you are holding. 1.6.6 Step 5. The first piece of paper you placed on the desktop has an area of \( \frac{1}{2} \) the area of the A4. The second piece of paper has an area of \( \frac{1}{4} \) the area of the A4. Write the areas of the next three pieces of paper. 1.6.7 Explain why these areas form a geometric seauence

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1.3.2 Make a conjecture with regard to \( r^{n} \) and \( S_{n} \) as \( n \rightarrow \infty \) (2) 1.4 CASE 3: \( r=1 \) 1.4.1 What is the sum of the geometric series \[ S_{n}=a+a r+a r^{2}+\ldots a r^{n-1} \text { if } r=1 \text { ? } \] 1.4.2 Make a conjecture with regard to \( r^{n} \) and \( S_{n} \) as \( n \rightarrow \infty \) (2) 1.5 CASE 4: \( r=-1 \) 1.5.1 What is the sum of the geometric series \[ S_{n}=a+a r+a r^{2}+\ldots a r^{n-1} \text { if } r=-1 ? \] 1.5.2 Do the sums above approach some finite particular number as \( n \rightarrow \infty \) i.e. is the sequence divergent or convergent? 1.6 CASE 5: \( -1<r<1 \) REQUIREMENTS: - One A4 papers - Provided grid 1.6.1 Write THREE possible values of \( r \) such that \( -1<r<1 \). 1.6.2 Step 1. Cut the A4 size paper along the longest side into two equal Rectangles and define their areas to be 16 unit \( ^{2} \). 1.6.3 Step 2. Place one half of the rectangle in Step 1 on the desktop and cut the other half along the longest side in to two equal rectangles. 1.6.4 Step 3. Place one half of the rectangle in Step 2 on the desktop and cut the other half along the longest side into two equal rectangles. 1.6.5 Step 4. Continue with the procedures from Step 3 until you find it too difficult to fold and cut the piece of paper you are holding. 1.6.6 Step 5. The first piece of paper you placed on the desktop has an area of \( \frac{1}{2} \) the area of the A4. The second piece of paper has an area of \( \frac{1}{4} \) the area of the A4. Write the areas of the next three pieces of paper. 1.6.7 Explain why these areas form a geometric seauence
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