Respuesta :

miriyu
c^2 + 3c - 40 = 0

consider the factors of -40: ±40, ±1, ±8, ±5...those last two could work, if you pair them right. try:

(c + 8)(c - 5)

8 - 5 = 3 and 8*(-5) = -40 so there u go