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- June 3rd 2009, 04:58 AM #1
## Is this right MK2

Hi guys,

Got this bit right.......... thanks for the conformation

(a) Expand ( x + ⅟x )² = x² + 2x⅟x + ⅟x₂ = x² + 2 + ⅟x₂

(b) Suppose that x + ⅟x = 3. Use part (a) to evaluate x² + ⅟x² without attempting to find the value of x.

ok my thoughts are..... ( x + ⅟x )² = (3)² from above.

so i think i should use the solution x² + 2 + ⅟x₂ which would be 9 + 2.

The question asks me to evaluate, but I think I may be on the wrong track. as I feel I am solving for x.

Am I doing the wrong thing here?

- June 3rd 2009, 05:26 AM #2

- June 3rd 2009, 05:31 AM #3

- June 3rd 2009, 05:38 AM #4