Chapter 3: Problem 374
Use the given volume and radius of a cylinder to express the height of the cylinder algebraically. Volume is \(\pi\left(3 x^{4}+24 x^{3}+46 x^{2}-16 x-32\right),\) radius is \(x+4.\)
Short Answer
Expert verified
The height \( h \) is \( \frac{3x^4 + 24x^3 + 46x^2 - 16x - 32}{(x+4)^2} \).
Step by step solution
01
Recall the volume formula for a cylinder
The volume \( V \) of a cylinder is given by the formula \( V = \pi r^2 h \), where \( r \) is the radius and \( h \) is the height of the cylinder.
02
Set up the equation for height
Given the volume \( V = \pi(3x^4 + 24x^3 + 46x^2 - 16x - 32) \) and the radius \( r = x + 4 \), we can use the formula \( V = \pi r^2 h \). Substitute the known values into the formula to identify the expression for height: \[ \pi(3x^4 + 24x^3 + 46x^2 - 16x - 32) = \pi (x + 4)^2 h \].
03
Cancel \(\pi\) from both sides
Divide both sides of the equation by \( \pi \) to simplify: \[ 3x^4 + 24x^3 + 46x^2 - 16x - 32 = (x + 4)^2 h \].
04
Expand the squared radius
Calculate \((x + 4)^2\) separately to manage the expression. Expanding, we have: \[ (x + 4)^2 = x^2 + 8x + 16 \].
05
Solve for height \( h \)
Substitute \( (x + 4)^2 \) into the equation, and then isolate \( h \) by dividing the polynomial on the left by the resulting quadratic expression: \[ h = \frac{3x^4 + 24x^3 + 46x^2 - 16x - 32}{x^2 + 8x + 16} \].
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Key Concepts
These are the key concepts you need to understand to accurately answer the question.
Algebraic Manipulation
Algebraic manipulation is a crucial skill when working with equations and expressions. It allows you to rearrange, simplify, or solve for a variable, transforming complex expressions into more manageable forms. In the context of finding the height of a cylinder, we begin by using the standard volume formula for a cylinder, \( V = \pi r^2 h \). Given variables in the problem, such as the volume in polynomial form and a specific radius, we substitute these into the formula and manipulate the equation to isolate and solve for height \( h \).
Here’s a quick overview of how to apply algebraic manipulation in this context:
Here’s a quick overview of how to apply algebraic manipulation in this context:
- Substitute the given volume polynomial and value of \( r \) into the cylinder volume formula.
- Cancel out common terms such as \( \pi \) from both sides to simplify the equation.
- Expand expressions where necessary to prepare for division or further simplification, which helps in isolating \( h \).
Cylinder Height Calculation
Calculating the height of a cylinder when given its volume and radius involves careful algebraic manipulation. The primary method is to first set up the equation using the volume formula \( V = \pi r^2 h \), and then solve for \( h \).
Let's summarize the steps to calculate the height as per the exercise:
Let's summarize the steps to calculate the height as per the exercise:
- Set the given volume expression equal to \( \pi r^2 h \).
- Cancel \( \pi \) from both sides if applicable to simplify the equation.
- Replace \( r^2 \) with the expanded form \((x+4)^2 = x^2 + 8x + 16\).
- Finally, divide the entire polynomial expression representing the volume by the squared term \((x+4)^2\) to isolate \( h \).
Polynomial Division
Polynomial division is an essential technique in simplifying expressions and solving equations involving polynomials. In this exercise, polynomial division helps find the height \( h \) by dividing the given volume polynomial by the squared radius expression.
Here’s how polynomial division is applied:
Here’s how polynomial division is applied:
- Start by identifying the dividend, which is the polynomial expression of the volume \( 3x^4 + 24x^3 + 46x^2 - 16x - 32 \).
- The divisor, in this case, is the squared radius \( x^2 + 8x + 16 \), derived from \((x+4)^2\).
- Perform polynomial long division or synthetic division to divide the volume polynomial by the squared radius.
- The quotient obtained represents the height \( h \), satisfying the equation for cylinder volume.