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September 17, 2014

September 17, 2014

Posted by **Ann** on Monday, September 30, 2013 at 11:15pm.

Its height measured in feet is given in terms of time t, measured in seconds by the equation h=−16t2+72t+364.

How high will the ball go?

To get how high the ball will go, am I supposed to factor −16t2+72t+364 or something?

- Pre-Calculus -
**Ann**, Monday, September 30, 2013 at 11:21pmSorry, the equation is −16t^2+72t+364

- Pre-Calculus -
**Steve**, Monday, September 30, 2013 at 11:22pmnah. just recognize it's a parabola. Find the vertex. That will tell you how long it takes to get to its highest altitude. Then plug that value in for t in h(t) as given.

Finding the vertex of a parabola is easy, right. Algebra I.

- Pre-Calculus -
**Ann**, Monday, September 30, 2013 at 11:34pmoh ok. But if I wanted to find how long it takes the ball to come back to the ground then I would have to factor it right?

- Pre-Calculus -
**Steve**, Monday, September 30, 2013 at 11:39pmwell, you could, or just use the Quadratic Formula. If you want to factor it, then we have

-16t^2+72t+364

-4(4t^2-18t-91)

Hmmm. Better stick with the QF.

- Pre-Calculus -
**Ann**, Monday, September 30, 2013 at 11:52pmthanks

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