The perimeter of a triangle is 6p2 – 4p + 9 and two of its sides are p2 – 2p + 1 and 3p2 – 5p + 3. Find the third side of the triangle.
3p2 + 5p – 4
8p2 + 11p – 7
5p2 – 5p + 9
2p2 + 3p + 5
