Jake throws a stone off a bridge into the river. The stones height in meters above the water is based on the time in seconds after jake threw the stone. The quadratic equation y=-5^2+10x+15 represents the scenario

The stone will hit the water after 3 seconds

Step-by-step explanation:

Given

Required

At what time will the stone enter the water

When the stone enters the water;

So, we have:

Divide through by -5

Expand

Factorize

Factor out x + 1

Solve for x

x (time) cannot be negative.

So:

-12 > a

step-by-step explanation:

-11 > 1 + a

subtract 1 from each side

-11-1 > 1-1+a

-12 > a