Does anyone know how to do this? How do you know if you do just 150=4x-6 OR 150+4x-6=180? I don’t understand how to tell which o
ne to use and I’m really struggling
1 answer:
You might be interested in
Answer:
6 seconds
Step-by-step explanation:
<u><em>The question in English is</em></u>
An object is thrown from a platform.
Its height (in meters), x seconds after launch, is modeled by:
h(x)=-5x^2+20x+60
How many seconds after the launch does the object reach the ground?
Let
x ----> the time in seconds
h(x) ---> the height of the object
we have
we know that
When the object hit the ground the height is equal to zero
so
For h(x)=0
we have
The formula to solve a quadratic equation of the form
is equal to
in this problem we have
so
substitute in the formula
The solution is x=6 sec
The he object reach the ground at x=6 seconds