Question

Use the quadratic formula to solve the problem.

A soccer player throws the ball onto the field from the sideline. An equation modeling the ball's flight is h = -16t^2 + 18t + 2. In how many seconds will the ball reach the ground?

In about 2 seconds.

In about 1.2 seconds.

In about 1.8 seconds.

Cannot be determined.

Answer 1

hits the ground when
\[h=0\] so write
\[-16t^2 + 18t + 2=0\] and solve for t

Answer 2

The ground means that the height is 0. Substitute 0 into the equation

0 = -16t^2 + 18t + 2.

and solve for t

Answer 3

then use a calculator to estimate. you will get about 1.2 i think

Answer 4

okaieee :)