Answer: The required value of x is 6.
Step-by-step explanation: We are given that segment AB and BC are tangent to the circle D as shown in he figure.
We are to find the value of x if AB = 3x + 8 and BC = 26.
We know that
The lengths of two tangents to a circle from any given point are equal.
So, the length of tangent AB and BC are equal.
That is,

Thus, the required value of x is 6.