Question

6^2 + 8^2 = C^2 C =

Answer 1

6*6 + 8*8 = C*C
36 + 64 = C*C
100 = C*C
sqrt(100) = sqrt(C*C)
+-10 = +-C
C = +-10

Answer 2

6^2=36
8^2=64

36+64=c^2
100=c^2
sqrt both sides
c=10 or -10