Khan Academy
Khan Academy: Add & Subtract Polynomials: Two Variables (Intro)
Example: Subtract or add polynomials. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Khan Academy
Khan Academy: Add & Subtract Polynomials: Two Variables (Intro)
Example: Subtract (x^2+2xy-y) and (3x+5xy+2y^2).