6 + -50 = -300
-300 = -2*2*3*5*5
- we need 2 numbers which add up to -5 and multiply to -50
from the factors of -300 they are -20 and 15, so we have
6x^2 + 15x - 20x - 50 = 0
3x(2x + 5) - 10(2x + 5) = 0
(3x - 10)(2x + 5) = 0
so x = 10/3 , -5/2 Answer