(x-2)(2x+5)
2x2 + x - 10
(3x3 + 2x - 10) + (5x3 - 2x2 - 7x + 3)
8x3-2x2-5x-7
(3x - 8)2
9x2-48x+64
(2x - 7)(2x + 7)
4x2-49
(10x4-4x2+3x-1) - (-3x4+5x2-x+4)
13x4-9x2+4x-5