= 8n3+36n2+54n+278n^3 + 36n^2 + 54n + 278n3+36n2+54n+27 - 8n3−12n2+6n−18n^3 - 12n^2 + 6n - 18n3−12n2+6n−1 = 8n^3 + 36n^2 + 54n + 27 - 8n^3 + 12n^2 - 6n + 1= 48n^2 + 48n + 28
= 8n3+36n2+54n+278n^3 + 36n^2 + 54n + 278n3+36n2+54n+27 - 8n3−12n2+6n−18n^3 - 12n^2 + 6n - 18n3−12n2+6n−1 = 8n^3 + 36n^2 + 54n + 27 - 8n^3 + 12n^2 - 6n + 1
= 48n^2 + 48n + 28