Answer:
C.) 7√3
Step-by-step explanation:
a^2 + b^2 = c^2
x^2 + 7^2 = 14^2
x^2 + 49 = 196
x^2 = 196 - 49
x^2 = 147
√x^2 = √147
√147 = √49 • √3
√49 = 7
√3 = √3
7√3
