### Home > CC4 > Chapter 5 > Lesson 5.1.1 > Problem 5-14

5-14.

Jackie and Alexa were working on homework together when Jackie said,*“I got x*= 5*as the solution, but it looks like you got something different. Which solution is right?”**“I think you made a mistake”*, said Alexa. Did Jackie make a mistake? Help Jackie figure out whether she made a mistake, and if she did, explain her mistake and show her how to solve the equation correctly. Jackie’s work is shown at right. Homework Help ✎

Remember that (*x* + 4)^{2} = (*x* + 4)(*x* + 4) and (*x* − 1)^{2} = (*x* − 1)(*x* − 1).