Please explain how to solve this

15. The distance, d metres, travelled by an object with initial velocity v m/s and acceleration a m/s, is given by the formula d = vt + ~at2. In factored form, it can be written in the M form d = - t( Mv + Nat) where M and N are integers. The value is N A. 4 B. N - C. 2 D. 4 Copyright @ by Absolute Value Publications. This book is NOT covered by the Cancopy agreement