Question 37226
2 Consecuitve numbers = X and X+1 ( e.g. 3 and 4 are consecuitve and they differ by 1)

Sum = X +X+1 = 2X+1
Product = X(X+1) = {{{X^2 +X}}}
Sum less than product by 11 which means Sum+11 = Product
{{{2x+1 +11 = X^2 +X}}}
Re-arranging
{{{X^2 -X-12}}}
*[invoke quadratic "x", 1, -1, -12 ]