Question 952740

{{{3x(2x + x^2) + 5x(3x -4x^2)}}}


{{{3x*2x + 3x*x^2 + 5x*3x -5x*4x^2}}}


{{{6x^2 + 3x^3 + 15x^2 -20x^3}}}


{{{3x^3-20x^3+6x^2  + 15x^2 }}}


{{{-17x^3+21x^2 }}}