Question 616447
={{{(4x^2-2x+6)-(x^2-11x+6)}}}
={{{4x^2-2x+6-x^2+11x-6}}}
={{{4x^2-x^2-2x+11x-6+6}}}
={{{3x^2+9x-cross(6)+cross(6)}}}
={{{3x^2+9x}}}
={{{3x(x+3)}}}