A water balloon is 5 feet above the ground when Sally launches it into the air. Use the quadratic equation 0 = -t2 + 4t + 5 to find how much time, t, it takes for the water ball…

Question

asked Oct 1, 2020 117k views

2 Answers

Chan Myae Thu · Answer 1 · 2020-10-01T23:36:23+0000

Answer:

2-sqrt14/2, 2+sqrt13/2.

Explanation:

What you do is you have to do the quadratic equation like it says in the problem.

x= −b± sqrtb^2 −4ac /2a .

a=-2, b=4, c=5.

x=-4±sqrt(4)^2-4(-2)(5)/2(-2).

x=-4±sqrt16+40/-4.

x=-4±2sqrt14/-2.

2-sqrt14/2, 2+sqrt13/2. is your answer once you have done everything.