Question 607660
{{{(1/5x^2-1/5x-3/4)+(1/10x^2-1/2x+1/2)}}}
{{{(1/5)x^2+(1/10)x^2-(1/5)x-(1/2)x-(3/4)+(1/2)}}}
{{{(3/5)x^2-(7/10)x-(1/2)}}}
*[invoke quadratic "x", 3/5, -7/10, -1/2 ]