Which expression finds the length of side
b
of this right triangle?

A right triangle with side lengths a, b, and hypotenuse c.
CLEAR CHECK

=2‾‾√−2‾‾√
b
=
c
2
-
a
2



=2−2‾‾‾‾‾‾‾√
b
=
c
2
-
a
2



=2‾‾√+2‾‾√
b
=
c
2
+
a
2



=2+2‾‾‾‾‾‾‾√