In the diagram, segments ad and ab are tangent to circle c. solve for x.

a)
x = 3

b)
x = 9

c)
x = 13

d)
x = 3; x = -3

the two segments AD and AB are equal therefore if you make the two equal to each other you will get the  

x^2+2=11 then you subtract two to put x squared on the side by itself
then you have x^2=9
then all you have to do is take the square root of 9 and x^2 and you get x=3 
thefore the answer is A