Question

The product of 2 consecutive positive integer is 306 find the integer

Answer 1

numbers are 

17, 18
-18,-17

Answer 2

let the number be "x"
so its consecutive number will be "x + 1"

now x * (x+1) = 306
x^2 + x = 306
x^2 + x - 306 = 0

after solving the quadratic equation
(x - 17) (x + 18)
so x = 17 or x = -18

so the answer can be 17 or -18
bcuz 17 * 18 = 306
and -18 * -17 = 306
but preferentially we can take answer as 17.