Find the maximum and minimum values of http://webwork2.math.nau.edu/webwork...910afc7a31.png on the ellipse http://webwork2.math.nau.edu/webwork...36086350d1.png.

maximum value =

minimum value =

so this is what i did:

http://qaboard.cramster.com/Answer-B...0937504123.gif

http://qaboard.cramster.com/Answer-B...5625005653.gif

http://qaboard.cramster.com/Answer-B...3125004367.gif

http://qaboard.cramster.com/Answer-B...3437503912.gif

http://qaboard.cramster.com/Answer-B...5000002452.gif

http://qaboard.cramster.com/Answer-B...1250003656.gif

http://qaboard.cramster.com/Answer-B...0468750966.gif

http://qaboard.cramster.com/Answer-B...7812503271.gif

http://qaboard.cramster.com/Answer-B...4062504703.gif

http://qaboard.cramster.com/Answer-B...0468750966.gif

http://qaboard.cramster.com/Answer-B...1875008648.gif

http://qaboard.cramster.com/Answer-B...9062508839.gif

http://qaboard.cramster.com/Answer-B...9687507480.gif

so i said my maximum was sqrt(5) and my minimum was -sqrt(5)

but it was incorrect. and i cannot see where i would have gone wrong. any help would be greatly appreciated.