How do I solve this complex equation?

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James Yang
James Yang 2018-12-19
评论： madhan ravi 2018-12-19
I have to solve the equation 4Z^4-11Z^2+7-3i=0, where Z is a complex number
My thoughts are to do this:
p=[4,0,-11,0,7-3i]
roots(p)
However, the answer I get is different from the actual answer, which is
2.4849+0.1552i
0.9924-0.2898i
-0.7273+0.1347i
Any help is appreciated!

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madhan ravi
madhan ravi 2018-12-19
编辑：madhan ravi 2018-12-19
I believe you are getting the correct answer
% method 1
syms Z
eqn=4*Z^4-11*Z^2+7-3i==0;
Root=vpasolve(eqn)
% method 2
roots(sym2poly(eqn))
  2 个评论
James Yang
James Yang 2018-12-19
These are my answers:
1.4438 + 0.1932i
0.8945 - 0.3118i
-1.4438 - 0.1932i
-0.8945 + 0.3118i
Is this what you got as well?
Is the answer key wrong then?

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