Respuesta :

This is an isosceles triangle: a triangle with two sides equals.
Therefore:
side BA=side CA
8x-4=5x+11

8x-5x=11+4
3x=15
x=15/3
x=5

length of  side BC=4x-2=4(5)-2=20-2=18.

The lenght of side BC is 18 units of lenth.