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

Course: Algebra (all content) > Unit 10

Lesson 3: Adding & subtracting polynomials: two variables
Math
Algebra (all content)
Polynomial expressions, equations, & functions
Adding & subtracting polynomials: two variables
© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Add & subtract polynomials: find the error

Google Classroom

Problem

Javier tried to subtract two polynomials. His work is shown below:
=(x4−3x2y2+y4)−(−11x4+4x2y2−3y4)=x4−3x2y2+y4+11x4−4x2y2+3y4Step 1=(1−3)x6+(−3+1)y6+(11−4)x6+(−4+3)y6Step 2=−2x6−2y6+7x6−y6Step 3
At which step did Javier make an error, if at all?
Choose 1 answer: