Find the polynomial expression given the following factors:

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John Doe
John Doe on 26 Nov 2021
Edited: Dyuman Joshi on 26 Nov 2021
Find the polynomial expression given the following factors:
  1. (𝑥 + 3)(𝑥 − 2)(𝑥 + 2)(𝑥 + 4)
>> r = [-3 2 -2 -4];
>> p = poly(r)
p =
1 7 8 -28 -48
Is this correct? I don't know how I can make the given into a proper polynomial expression. Also the 'syms' doesnt work on my matlab version which is R2019a.

Accepted Answer

Dyuman Joshi
Dyuman Joshi on 26 Nov 2021
Edited: Dyuman Joshi on 26 Nov 2021
It is correct.
syms x
expand((x+3)*(x-2)*(x+2)*(x+4))
ans = 
You can also use sym2poly if you have the symbolic toolbox to convert syms variable into coefficients.
P.S - And syms should work in R2019a

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