Answer:
[tex]BC=24\ units[/tex]
Step-by-step explanation:
The picture of the question in the attached figure
we know that
An isosceles triangle has two equal sides and two equal interior angles
In this problem
Triangle ABC is an isosceles triangle
because
m∠B=m∠C
therefore
AC=AB
substitute the given values
[tex]x+8=2x-1[/tex]
solve for x
[tex]2x-x=8+1\\x=9[/tex]
Find the length of side BC
[tex]BC=3x-3[/tex]
substitute the value of x
[tex]BC=3(9)-3=24\ units[/tex]
