[tex] a^{2} +b^{2} =c^{2} [/tex]
As we have to solve for b, it means we have to isolate b
So first of all subtract [tex] a^{2} [/tex] from both sides
So we get
[tex] b^{2} =c^{2} -a^{2} [/tex]
Now we need b , but its b^2 , so we can take square root on both sides.
taking square roots on both sides
[tex] b= +- \sqrt{c^2 -a^2} [/tex]
Hence option B is correct
