Please help!Due in a few hours
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Given:
The height of an object, f(x), after x seconds is
To find:
The time taken be object to hit the ground.
Solution:
We have,
The object will hit the ground if the height is 0, i.e., f(x)=0.
Divide both sides by 2.
Taking square root on both sides.
Time cannot be negative. So, x=4.
Therefore, the object will hit the ground after 4 seconds.