Problem 143 of 7
Correct the complex polynomial identity or factorization error: A student includes 2+i but omits 2-i for a real-coefficient polynomial.
Using a hint is okay. It just tells the trainer to give you a little more review.
Hidden until you reveal it.
catch missing conjugate, sign of i^2, incomplete factorization, and real/complex confusion.
Hidden until you reveal it.
Correction must fix missing conjugate, sign of i^2, incomplete complex factorization, or real/complex confusion.
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Your answer is equivalent to the expected form.
Walkthrough
Full solution stays hidden until you ask for it.
1. Identify the complex-number rule being violated.
2. Write the corrected factorization or root set.
3. Verify using i^2=-1 or conjugate pairing.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Only saying 'use complex numbers' without the corrected expression.