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Find the volume of a rectangular prism if the length is [tex]4x[/tex], the width is [tex]2x[/tex], and the height is [tex]x^3 + 3x + 6[/tex].

Use the formula [tex]V = l \cdot w \cdot h[/tex], where [tex]l[/tex] is length, [tex]w[/tex] is width, and [tex]h[/tex] is height, to find the volume.

A. [tex]6x^5 + 18x^3 + 36x^2[/tex]
B. [tex]6x^6 + 18x^3 + 36x^2[/tex]
C. [tex]8x^5 + 24x^3 + 48x^2[/tex]
D. [tex]8x^6 + 24x^3 + 48x^2[/tex]

Answer :

To find the volume of a rectangular prism, we use the formula:

[tex]\[ V = l \cdot w \cdot h \][/tex]

where [tex]\( l \)[/tex] is the length, [tex]\( w \)[/tex] is the width, and [tex]\( h \)[/tex] is the height. In the problem, the dimensions are given as follows:

- Length [tex]\( l = 4x \)[/tex]
- Width [tex]\( w = 2x \)[/tex]
- Height [tex]\( h = x^3 + 3x + 6 \)[/tex]

To calculate the volume, multiply these expressions:

1. First, calculate the product of the length and the width:

[tex]\[ l \cdot w = (4x) \cdot (2x) = 8x^2 \][/tex]

2. Next, multiply this result by the height:

[tex]\[ 8x^2 \cdot (x^3 + 3x + 6) \][/tex]

3. Distribute [tex]\( 8x^2 \)[/tex] across the terms in the height expression:

[tex]\[
\begin{align*}
8x^2 \cdot x^3 & = 8x^{2+3} = 8x^5 \\
8x^2 \cdot 3x & = 24x^{2+1} = 24x^3 \\
8x^2 \cdot 6 & = 48x^{2} \\
\end{align*}
\][/tex]

4. Combining these results gives the volume:

[tex]\[ 8x^5 + 24x^3 + 48x^2 \][/tex]

Therefore, the volume of the rectangular prism is [tex]\( 8x^5 + 24x^3 + 48x^2 \)[/tex].

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