Question 636330
={{{(1/7x^2-2/5)(1/2x-1/2)}}}
={{{(1/7x^2)(1/2x-1/2)-(2/5)(1/2x-1/2)}}}
={{{(1/7x^2)(1/2x)-(1/7x^2)(1/2)-(2/5)(1/2x)+(2/5)(1/2)}}}
={{{1/14x^3-1/14x^2-(cross(2)/5)(1/cross(2)x)+(cross(2)/5)(1/cross(2))}}}
={{{1/14x^3-1/14x^2-1/5x+1/5}}}