Question 25046
Hopefully you know the distance formula
 d^2=[(difference of x)^2 +(diff of y's)^2]
(2+3)^2+(a+2)^2 = 34
25 +(a+2)^2=34
    (a+2)^2=9
     a+2=3 or a+2=-3
     a=1 or a=-5

Cheers,
Stan H.