The product of two consecutive even numbers is 168. What are the numbers?

Question: The product of two consecutive even numbers is 168. What are the numbers?

Solution:
Let the smaller number be x,
so the next even number is = x + 2

According to the question,
x(x + 2) = 168
⇒ x² + 2x = 168
⇒ x² + 2x -168 = 0
⇒ x² + 14x - 12x - 168 = 0
⇒ x(x + 14) - 12(x + 14) = 0
⇒ (x + 14)(x - 12) = 0

⇒ x = - 14 and x = 12

If x = 12,
then the next even number =
12 + 2 = 14
The two numbers are: 12 and 14.

Again, If x = - 14, then the next even number = - 14 + 2 = - 12
So, the numbers are 12 and 14 or
- 14 and - 12