Answer :
Given:
The length of a rectangular prism is (x + 5), the width is (x - 4), and (x - 7).
To find:
The expression for the volume of the rectangular prism.
Solution:
It is known that the volume of the rectangular prism is given by:
[tex]V=l\times w\times h[/tex]So, the volume of the given rectangular prism is:
[tex]\begin{gathered} V=(x+5)(x-4)(x-7) \\ =(x^2+5x-4x-20)(x-7) \\ =(x^2+x-20)(x-7) \\ =x^3+x^2-20x-7x^2-7x+140 \\ =x^3-6x^2-27x+140 \end{gathered}[/tex]Thus, the expression for the volume of the rectangular prism is x^3 - 6x^2 - 27x + 140.