Question

I am currently in a section of my geometry book titled Applying Properties of Similar Triangles. This is a very easy section but there is on problem where I cannot figure out (forgot) the next step.

1. z-4 12
--- = ---
z/2 10

2.(z-4)10 = (z/2)12

3. 10z+40 = ?


Thank you for your time and your help would be appreciated a lot a lot a lot!!! :D please help

Answer 1

from (z-4)10 = (z/2)12
10z - 40 = 6z

take it from here.