What are the roots of the equation? x^2+2x-24=0

This is a very simple question. Observe and divide the last number "-24", you only get eight possibilities

{ (-1, 24), (1, - 24), (-2, 12), (2, - 12), (-3, 8), (3, - 8), (-4, 6), (4, - 6) },

then try to figure out which is the only set that can get "2".

By the way, the answer is (6, - 4).