Step-by-step explanation:
The centroid O cuts every median in the ratio 2:1. The distance between a vertex and the centroid is twice the distance between the centroid and the midpoint of the opposite side.
Therefore: |OB| = 2|OF|
|BF| = |OF| + |OB| = |OF| + 2|OF| = 3|OF|
3x+3=3(2x-8)
3x+3=6x-24
3x=27
x=9
