Answer:
BC = 4x-10
Step-by-step explanation:
[tex] \because B[/tex] is the midpoint of AC.
[tex] \therefore BC = \frac{1}{2} AC[/tex]
[tex] \therefore BC = \frac{1}{2} (8x-20)[/tex]
[tex] \therefore BC = \frac{1}{2} \times 2(4x-10)[/tex]
[tex] \huge \purple {\boxed {\therefore BC = 4x-10}} [/tex]
