How do you do this question

[tex] a = \sqrt{65} - 9 [/tex]
[tex] a = 8.06 - 9 [/tex]
[tex] a = -1.06 [/tex]
[tex] b = \sqrt{50} - 8 [/tex]
[tex] b = 7.07 - 8 [/tex]
[tex] b = -1.07 [/tex]
A. is not true.
B. is true.
C. is not true.
D. is not true.
Hope it helped
BioTeacher101