1)2x^2+8x+x+4=2x^2+9x+4 2)10x^2-8x+15x-12=10x^2+7x-12 3)6ax-3x-4a+2 4)20a^2-5ab-12ab-3b^2=20a^2-17ab-3b^2 5)4m^2-10mn+6mn-15n^2=4m^2-4ab-15n^2 6)2x^2-3xy+2xy-2y^2=2x^2-xy-2y^2 7)10b^2-10bc-8cb+8c^2=10b^2-18bc+8c^2 8)8p^2+5pq-24pq-15q^2=8p^2-19pq-15p^2