Solve the inequality (x - 2)(x + 6) \le (x - 2)(x + 5). Write your answer in interval notation.
(x−2)(x+6)≤(x−2)(x+5)
x2+4x−12≤x2+3x−10
4x−12≤3x−10
x≤2
Be careful when you divide by x - 2, because it can remove a possible solution, and also mess with the inequality sign!
Your answer in interval notation is (-inf, 2]