A Daredevil Jumps Off A Tall Building. He Falls Freely For Several Seconds Before Releasing His Parachute . His Height (h) In Meters , T Seconds After Jumping Can Be Modeled By : h=-4.9t^2+t+360 before he releases his parachute and h=-4t+142 After He Releases His Parachute . How Long After Jumping Did He Release His Parachute ? HELPP ME PLEASE !!!!
@imqwerty

- anonymous

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- anonymous

The height functions will be equal when he releases the parachute
\[-4.9t^2+t+360=-4t+142\]
Make one side equal to 0 and use the quadratic equation to solve

- Plasmataco

He falls for218 meter

- anonymous

How ?

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## More answers

- Plasmataco

Are u asking me?

- anonymous

im asking whoever can help me solve thus problem

- anonymous

Do you know the quadratic equation?

- anonymous

No But I Know How To Do The Formula

- anonymous

sry, I meant formula

- anonymous

The equation is in my first post

- anonymous

Oh Yea i Had That

- anonymous

what do you have?

- anonymous

-4.9t^2 + t +360 = 4t +142

- anonymous

Thats All I Have I Dont Know The Next Step.

- anonymous

It should be -4t + 142 on the right side.
the next step is to make one side be 0 by adding or subtracting everything on that side of the equation. You have -4t on the right side. How would you move it from the right to the left?

- anonymous

Can You Please Explain

- anonymous

By Drawing So I Can Get A Visual Picture .

- anonymous

Is one of these what you want? Not really sure what you're asking for?|dw:1439936124822:dw|
|dw:1439936251767:dw|

- anonymous

So Where It Says Add Or Subtract ?

- anonymous

ill subtract the 4t

- anonymous

You want to add the 4t because it's actually -4t (at least it is in the original problem statement).
Whatever the sign is, do the opposite

- anonymous

Ok Can You Draw It Out ?

- anonymous

|dw:1439936950147:dw|

- anonymous

Right Right There It Is

- anonymous

AND Now I Do The Formula .

- anonymous

Correct ?

- anonymous

yeah, what did you get as the equation though? I left the addition/subtraction for you to do

- anonymous

-4.9t^2 + 364 -142=0

- anonymous

I aligned the terms so you can actually add straight down.
What's\[t+4t=\] and \[360-142=\]

- anonymous

4t^2 and 218

- anonymous

t + 4t = 5t
(add the coefficients, never change the exponents when adding or subtracting). So this is the equation
|dw:1439937754826:dw|

- anonymous

I Plugged Them In.

- anonymous

ok. what did you get for t?

- anonymous

x=-6
x2=7

- anonymous

yeah, closer to -6.2 and 7.2?

- anonymous

Yeah

- anonymous

Do You Mind Helping Me Again Ill Tag You If So

- anonymous

yeah

- anonymous

Ok

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