SOLUTION: If x + 1/x = 3, then what is x^2 + 1/x^2?

Question 1090595: If x + 1/x = 3, then what is x^2 + 1/x^2?
Answer by ikleyn(52894) (Show Source): You can put this solution on YOUR website!
.

If   +  = 3  then  (square both sides)

 +  +  = 9,   or

 + 2 +  = 9,    which implies

 +  = 9 - 2 = 7.


Answer.  If   +  = 3  then   +  = 9 - 2 = 7.

Solved.

Many similar problems solved and presented in the lesson
- HOW TO evaluate expressions involving , , and
in this site.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
- ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lesson is the part of this online textbook under the topic "Evaluation, substitution".

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