Question 896758
There are several ways to figure this out.
sqrt(210)=abt 14.5
So a first attempt would be 14*15 which works.
and of course the negatives -15*-14=210
x*(x+1)=210
x^2+x-210=0
*[invoke change_this_name4450 1, 1, -210, "x"]

which leads to the same solutions.
x=14 x+1=15
x=-15 x+1=-14