2015 AIME Question #10 Error?

There must be a mistake in my solution.

 

所有跟帖： 

• 满足原题的多项式是存在的 -怪哉- ♂ (68 bytes) () 10/16/2015 postreply 16:06:46

• Yes, I realized that. -dr_yin- ♂ (198 bytes) () 10/16/2015 postreply 17:01:49

• d^2=-36a^2+1这步怎么得来的？ -怪哉- ♂ (0 bytes) () 10/16/2015 postreply 16:13:09

• 您的解法中间有一步好像有问题： -怪哉- ♂ (144 bytes) () 10/16/2015 postreply 16:21:04

• Solution -dr_yin- ♂ (87 bytes) () 10/16/2015 postreply 17:12:13

• 这个解法里面没有得出c=0 -怪哉- ♂ (100 bytes) () 10/16/2015 postreply 19:25:38

• Thanks -dr_yin- ♂ (0 bytes) () 10/17/2015 postreply 10:57:34

• fully expand your equations, c^2 = 49 * a^2 -mondayadvisor- ♀ (290 bytes) () 10/17/2015 postreply 12:14:15

• Thanks. -dr_yin- ♂ (0 bytes) () 10/17/2015 postreply 16:18:24

• different way to solve it -mondayadvisor- ♀ (1131 bytes) () 10/16/2015 postreply 20:15:17