Pls help me lol (2x2 - 5)(3x2 + 4)

a
6x^4 + 7x^2 - 20
b
6^x4 + 23x^2 - 20
c
6x^4 - 7x^2 - 20
d
6x^4 - 23x^2 - 20

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem