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but z3=-6??, modulus cant be negative right? could you please solve z3=-6 step by step for me?

but z3=-6??, modulus cant be negative right? could you please solve z3=-6 step by step for me?

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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how do you solve 

z6 − 2z3 + 1 = 49. in the complex plane

I get as far as (z3-8)(z3+6)=0, and I can solve z3=8, but z3=-6??, modulus cant be negative right? could you please solve z3=-6 step by step for me?

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