the product of twon numbers is less than 340. one of the numbers is 3 less than the other. what are the possible values of the larger number?

this is my interpretation

1=> x

2=> x-3

P=> x(x-3)< 340

x(-3)<340

x^2-3x<340

x^2-3x-340<0

there are no factors. so I need to use the quadratic formula??