How to simplify -4 + 4h - (-1+3h-3h^2+h^3)

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SUMMARY

The discussion centers on the simplification of the expression -4 + 4h - (-1 + 3h - 3h² + h³). The correct simplification yields -3 + h + 3h² - h³. However, a computer program accepted the unsimplified version but rejected the simplified one, likely due to the expected order of terms. This highlights potential flaws in automated grading systems that do not accommodate different valid forms of answers.

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Homework Statement


-4 + 4h - (-1+3h-3h^2+h^3)


Homework Equations





The Attempt at a Solution


-4 + 4h + (1-3h+3h^2-h^3)
= -3 + h +3h^2 -h^3

I am doing independent study on a computer program and it accepted my unsimplified answer as correct, but not my simplified one. What is wrong with my simplified answer?
 
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morrowcosom said:

Homework Statement


-4 + 4h - (-1+3h-3h^2+h^3)


Homework Equations





The Attempt at a Solution


-4 + 4h + (1-3h+3h^2-h^3)
= -3 + h +3h^2 -h^3

I am doing independent study on a computer program and it accepted my unsimplified answer as correct, but not my simplified one. What is wrong with my simplified answer?

Nothing.
 
Is it possible the program "expected" terms to be written in decreasing order?
A similar thing happened to my son on a test for an on-line history class: he selected as an answer "b: hot and dry" in a multiple-choice quiz. It was marked incorrect: the program gave the correct answer as "c: dry and hot".
Poorly-constructed computer assessment packages are next to worthless.
 

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