Explanation:
The soccer ball was kicked in the air and follows the path as :

Here, x is the time in seconds and h is the height of the soccer ball.
We need to find the time at which the soccer ball hit the ground. It means that its height at a function of time becomes 0. So,
h(x) = 0

The above equation is a quadratic equation. It can be calculated as :

So, at 2 seconds the ball will hit the ground.