If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Precalculus

Course: Precalculus > Unit 3

Lesson 4: Identities with complex numbers
Math
Precalculus
Complex numbers
Identities with complex numbers
© 2023 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Factor polynomials: complex numbers

Google Classroom

Problem

Shayla tried to write x4−25 as a product of linear factors. This is her work:
=x4−25=(x2+5)(x2−5)Step 1=(x2+5)(x+5)(x−5)Step 2=(x+5i)(x−5i)(x+5)(x−5)Step 3
In what step did Shayla make her first mistake?
Choose 1 answer:
Stuck?
Stuck?