Conics Problem Part 5

[temaire]

Homework Statement

http://img93.imageshack.us/img93/6889/arch4gh8.jpg [Broken]​

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Homework Equations

Above

The Attempt at a Solution

All good?

 

[konthelion]

Looks fine except 4(b) Check the range again.

 

[temaire]

Oh yeah, I meant to write 11 instead of 10. Thanks for the help konthelion.