Question 195036
{{{(2x^3-5x^2+4x)(-6x^2-3x+1)}}}
={{{2x^3*(-6x^2-3x+1)-5x^2*(-6x^2-3x+1)+4x*(-6x^2-3x+1)}}}
={{{-12x^5-6x^4+2x^3+30x^4+15x^3-5x^2-24x^3-12x^2+4x}}}
={{{-12x^5-6x^4+30x^4+2x^3+15x^3-24x^3-5x^2-12x^2+4x}}}
={{{-12x^5+(-6+30)x^4+(2+15-24)x^3+(-5-12)x^2+4x}}}
={{{-12x^5-24x^4-7x^3-17x^2+4x}}}

OK