Answer:
\sqrt{40\\} (Square Root of 40)
Step-by-step explanation:
Use Pythagorean theorem formula and solve backwards
a^2 + b^2 = c^2
a and b are the lengths of the legs (a is leg 1 and b is leg 2)
c is the the hypotenuse
(substitute legs and hypotenuse) 3^2 + b^2 = 7^2
(simplify) 9 + b^2 = 49
(Solve) (9-9) + b^2 = 49-9 = b^2 = 40
(transform to Square root) b= [tex]\sqrt{40\\}[/tex]
