2
6
18
12
5
Correct answer is D
(3x+1)2=(3x−1)2+x2 (Pythagoras's theorem)
9x2+6x+1=9x2−6x+1+x2
x2 - 12x = 0
x(x - 12) = 0
x = 0 or 12
The sides cannot be 0 hence x = 12.
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