Question 189998
{{{(x-4)(2x^2 + 4) + (x + 4)(x^3-1)-( x^2-x-1) }}} Start with the given expression



{{{x(2x^2 + 4)-4(2x^2 + 4) + x(x^3-1) +4(x^3-1)-( x^2-x-1) }}} Expand



{{{2x^3 + 4x - 8x^2 -16 + x^4 - x +4x^3 - 4 - x^2 + x + 1 }}} Distribute



{{{x^4+6x^3 - 9x^2 + 4x  -19 }}} Combine like terms.



So {{{( x- 4)(2x^2 + 4) + ( x + 4)(x^3-1) -( x^2- x -1)=x^4+6x^3 - 9x^2 + 4x  -19  }}}