Question 157458
{{{(x-4)(2x^2+4)+(x+4)(x^3-1)-(x^2-x-1)}}}=

{{{(2x^3+4x -8x^2 -16) + (x^4-1x +4x^3-4) - (x^2-x-1)}}}=

{{{(x^4) + (2x^3 + 4x^3) - (8x^2+x^2)+4x-(16+4-1)}}}=

{{{x^4 + 6x^3 - 9x^2 + 4x -19}}}