If you factor the expression, you will get ( x + 6) ( x - 2 ). If both values inside the parentheses are + or - then the equality is satisfied, e.g., equal to or greater than one. If the values are opposite in sign, then the get a negative value, which does not satisfy. So on the number line mark + 2 and - 6. All values between will not satisfy and all values outside will. In interval notation we have ( - inf, - 6] U [2 . + inf) for solution.