How to find the missing integer

Question

Find three consecutive odd integers such that the product of the first and second integers minus the largest is 302. 

Answer 1

FS- L = 302

x(x+2) - (x+4) = 302

x^2 +2x -x -4 = 302

x^2 +x -306 = 0

(x- 18)(x-17) = 0

x = 17 or 18, but only 17 is odd

3 consecutive odd integers are 17, 19, and 21

17(19) -21 = 302

323 -21 = 302