Writing volume in polynomial form (question inside)

Question

anonymous · Answer

anonymous · Answer

Not sure how to do this, any help would be nice

mathstudent55 · Answer

What is the volume of that kind of solid?
If the solid had a length of 2 in., a width of 3 in., and a height of 4 in., how would you calculate its volume?

anonymous · Answer

lwh
lengthxwidthxheight

mathstudent55 · Answer

Correct.
You are given a length, a width, and a height for your solid. Just multiply them together.

mathstudent55 · Answer

V = lwh
V = (h + 12)(2h + 1)(h)

Use FOIL for the first product.
Can you do that?

anonymous · Answer

yes

anonymous · Answer

2h^2 - h - 24h - 12

anonymous · Answer

Sorry for the delay there

mathstudent55 · Answer

The numbers are correct, but all signs should be positive because there are no negative signs involved.

anonymous · Answer

Oh, I've always been confused about how that works with FOIL

mathstudent55 · Answer

It works just like multiplication. Positive times positive and negative times negative are both positive. Positive times negative and negative times positive are both negative.

mathstudent55 · Answer

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