If a, b and C are positive; a^2 + c^2 = 202; what's b-a-c?
1) b^2 + c^2 = 225
2) a^2 + b^2 = 265
Here's what I did: I found all possible combinations for b,c to be positive and such that sum of their squares equal to 225.
Possible values = b|c = 12|9 or 9|12; however, if you add another equation (a^2 ...) you would get unique a, b and c
Similarly, we can do it for #2).
My answer was D). OA is C.
Can anyone please explain why?
Thanks
Voodoo
1) b^2 + c^2 = 225
2) a^2 + b^2 = 265
Here's what I did: I found all possible combinations for b,c to be positive and such that sum of their squares equal to 225.
Possible values = b|c = 12|9 or 9|12; however, if you add another equation (a^2 ...) you would get unique a, b and c
Similarly, we can do it for #2).
My answer was D). OA is C.
Can anyone please explain why?
Thanks
Voodoo
Last edited by voodoo_child on Wed Sep 28, 2011 6:54 am, edited 1 time in total.
