If 4x + 4/x = 40, what is the value of x^2 + 1/x^2?

Sorry, I haven't gotten used to LaTex yet, so I'll be posting an image again:

Attachment 24495

My answer is 100, but the book says 98. How do you solve this?

Thank you!

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- August 12th 2012, 02:13 AMviccalIf 4x + 4/x = 40, what is the value of x^2 + 1/x^2?
If 4x + 4/x = 40, what is the value of x^2 + 1/x^2?

Sorry, I haven't gotten used to LaTex yet, so I'll be posting an image again:

Attachment 24495

My answer is 100, but the book says 98. How do you solve this?

Thank you! - August 12th 2012, 02:16 AMProve ItRe: If 4x + 4/x = 40, what is the value of x^2 + 1/x^2?
- August 12th 2012, 02:35 AMviccalRe: If 4x + 4/x = 40, what is the value of x^2 + 1/x^2?
Oh, wow! Thanks a lot! I didn't realize how careless I was in solving it. Thanks!