How do you make it so that the simplify function displays the correct answer?

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Andrew Wong
Andrew Wong 2022-5-8
回答： Walter Roberson 2022-5-8
syms s
simplify((s+30)*(s^2-20*s+200))
^ This is the code that I have currently. Instead of simplifying the entire expression, Matlab is just returing the original expression back to me: (s + 30)*(s^2 - 20*s + 200). How can I change it so that the entire expression actually gets simplified?

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回答（2 个）

Steven Lord
Steven Lord 2022-5-8
Ran in:
syms s
simplify((s+30)*(s^2-20*s+200))
ans = 
expand((s+30)*(s^2-20*s+200))
ans = 
Walter Roberson
Walter Roberson 2022-5-8
(s^2 - 20*s + 200)
The roots of that are 10 +/- 10i . So that expression is already fully factorized to real coefficients, and what you got is already the simplest version, under quite reasonable meanings of "simplify".

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