Illustrative Mathematics
Illustrative Mathematics: A Rei Radical Equations
The purpose of the task is to show students a situation where squaring both sides of an equation can result in an equation with more solutions than the original one, because it is possible to have two unequal numbers whose squares are...
Khan Academy
Khan Academy: Extraneous Solutions of Equations
Practice some problems that involve thinking about the conditions for obtaining extraneous solutions while solving radical equations. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...
Khan Academy
Khan Academy: Square Root Equations Intro
Solve square-root equations by taking the square of both sides. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.
Khan Academy
Khan Academy: Solve Square Root Equations
Solve square-root equations by first arranging them and then taking the square of both sides. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video, or receive hints.