Question

Please answer this question fast​

Answer 1

AD is median, So DB=DC.

AB^2=EA^2+BE^2

AC^2=EA^2+EC^2  

Adding both,  

AB^2+AC^2 = 2 EA^2+BE^2+CE^2  

= 2(AD^2-ED^2)+(DB-ED)2+(DC+ED)2  

= 2 AD^2-2 ED^2+DB^2+ED^2-2 BD.ED+DC^2+ED^2+2 CD.ED  

= 2 AD^2+DB^2+CD^2  

= 2(AD^2+ DB^2)