1st Empty box answer choices: -4n^3+24n^2+12n,

-4n^3+24n^2-12n

4n^3+24n^2-12n

2nd Empty box answer choices:
4n^4-24n^3+12n^2

-4n^4+24n^3+12n^2

4n^4+24n^3+12n^2

Given: ae ≅ ce ; de ≅ be prove: abcd is a parallelogram. we have that ab || dc. by a similar argument used to prove that △aeb ≅ △ced, we can show that △ ≅ △ceb by. so, ∠cad ≅ ∠ by cpctc. therefore, ad || bc by the converse of the theorem. since both pair of opposite sides are parallel, quadrilateral abcd is a parallelogram.