Using arithmetic operations, rewrite this polynomial in standard, simplest form.

(3x2 + 9x + 6) − (8x2 + 3x − 10) + (2x + 4)(3x − 7)

x2 + 4x − 12
x2 + 8x − 42
17x2 + 10x − 32
17x2 + 14x + 24

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.