How can I solve this: (x-2)*(x+1)^3?

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LUCA GIROTTI
LUCA GIROTTI 2022-3-10
编辑： Sam Chak 2022-3-10
Hey there,
I am trying to process this "(x-2)*(x+1)^3" through matlab in way that I can have a result like this:
However every time I try to perform this operation, matlab keeps on telling me that x is set to nothing, how can I solve this?
Thanks in advance!

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采纳的回答

Ayaz Siddiqui
Ayaz Siddiqui 2022-3-10
编辑：Ayaz Siddiqui 2022-3-10
Try using expand.
syms x;
expand((x-2)*(x+1)^3)

更多回答（1 个）

Sam Chak
Sam Chak 2022-3-10
Hi @LUCA GIROTTI
It's good to hear that you tried working out something by yourself. You need to create a symbolic variable for x.
syms x
For more info, please check:
https://www.mathworks.com/help/symbolic/create-symbolic-numbers-variables-and-expressions.html
  2 个评论
LUCA GIROTTI
LUCA GIROTTI 2022-3-10
Thank you for your answer @Sam Chak
I tried using "syms x" however thats the result I have (with this input (x-2)*(x+1)^3) :
(x + 1)^3*(x - 2)
Much better since I indeed don't have an error anymore, however it hasn't fully performed the operation.
Sam Chak
Sam Chak 2022-3-10
编辑：Sam Chak 2022-3-10
Hi @LUCA GIROTTI
Good to hear that. If you are dealing with algebraic expressions and analytical problems, you will be using syms a lot! You can find lots of examples and learn a lot of functions here to perform many types of symbolic computations:
https://www.mathworks.com/help/symbolic/performing-symbolic-computations.html

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