Question 6334
one easy way to do it is to just bite the bullet and solve the equation and then find out sum and product of roots x1 and x2. Another is to note that for equations {{{x^2 + bx + c =0}}}, b is the sum of roots and c is their product. 

that means looking at equation x^2+4x-3/2 = 0. sum is 4, product is -3/2.

*[invoke quadratic "x", 2, 8, -3]