Math Problem Statement

The volume of a cylinder is given by the formula , where r is the radius of the cylinder and h is the height. Suppose a cylindrical can has radius (x + 8) and height (2x + 3). Which expression represents the volume of the can?

Solution

The volume VV of a cylinder is given by the formula:

V=πr2hV = \pi r^2 h

In this case, the radius rr is x+8x + 8 and the height hh is 2x+32x + 3.

To find the expression for the volume of the can, substitute the given values of rr and hh into the formula:

V=π(x+8)2(2x+3)V = \pi (x + 8)^2 (2x + 3)

Now, let's expand this expression step by step.

  1. Expand (x+8)2(x + 8)^2:

(x+8)2=x2+16x+64(x + 8)^2 = x^2 + 16x + 64

  1. Now, multiply the result by (2x+3)(2x + 3):

(x2+16x+64)(2x+3)=x2(2x+3)+16x(2x+3)+64(2x+3)(x^2 + 16x + 64)(2x + 3) = x^2(2x + 3) + 16x(2x + 3) + 64(2x + 3)

  1. Expanding each term:

=2x3+3x2+32x2+48x+128x+192= 2x^3 + 3x^2 + 32x^2 + 48x + 128x + 192

  1. Combine like terms:

=2x3+(3x2+32x2)+(48x+128x)+192= 2x^3 + (3x^2 + 32x^2) + (48x + 128x) + 192 =2x3+35x2+176x+192= 2x^3 + 35x^2 + 176x + 192

So, the expression for the volume VV of the cylindrical can is:

V=π(2x3+35x2+176x+192)V = \pi (2x^3 + 35x^2 + 176x + 192)

This is the expanded form of the volume of the cylinder.

Do you have any further questions or need more details?

Here are five related questions:

  1. How does changing the radius affect the volume of the cylinder?
  2. What happens to the volume if both the radius and height are doubled?
  3. Can you express the volume formula in terms of the diameter instead of the radius?
  4. How can you calculate the surface area of the cylinder using the given dimensions?
  5. What is the volume if x=1x = 1?

Tip: When dealing with polynomials, always expand and combine like terms to simplify your expressions.

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Math Problem Analysis

Mathematical Concepts

Geometry
Polynomials

Formulas

Volume of a cylinder: V = π r^2 h

Theorems

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Suitable Grade Level

High School