Question

What's the answer to this question

Answer 1

Since it is a right triangle, x squared + 6 squared = 9 squared. So:

x squared + 36 = 81

x squared = 45

I believe it is C?

Answer 2

9^2 - 6^2 = x^2
81- 36=x^2
x^2 = 45
x = √45
x= √5×3 ×3
x=3 √5

the answer is D