SOLUTION: A student is solving the equation s^2=9^2 and has determined that s=9. He or she has looked up the answer in the back of the book and finds that s=-9 is also a solution. The stud

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Question 315873: A student is solving the equation s^2=9^2 and has determined that s=9. He or she has looked up the answer in the back of the book and finds that s=-9 is also a solution. The student feels this is a misprint. How would you advise the student?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Simply show him/her that %28-9%29%5E2=%28-9%29%2A%28-9%29=81 and %289%29%5E2=9%2A9=81 which can only mean that %28-9%29%5E2=9%5E2=81