Step-by-step explanation:
t^2-4xt-12/t-8
= -(t^2-4-6)/4
= -t^2+4+6/4
=<u> -t^2+6</u>
1. Given
2. AD is parallel to BC
3. ∠3 ≅ ∠2
4. transitive property of congruence
5. Definition of bisect
