SOLUTION: An object is thrown upward at a speed of 132 feet per second by a machine from a height of 7 feet off the ground. The height h of the object after t seconds can be found using the

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: An object is thrown upward at a speed of 132 feet per second by a machine from a height of 7 feet off the ground. The height h of the object after t seconds can be found using the       Log On


   

Question 1166740: An object is thrown upward at a speed of 132 feet per second by a machine from a height of 7 feet off the ground. The height h of the object after t seconds can be found using the equation h=-16t^2+132t+7. When will the height be 108 feet? When will the object reach the ground?
Answer by ikleyn(52780) About Me  (Show Source):
You can put this solution on YOUR website!
.

To answer first question, you should solve this quadratic equation

    -16t^2 + 132t + 7 = 108.



To answer second question, you should solve this quadratic equation

    -16t^2 + 132t + 7 = 0.

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To see many similar solved problems, look into the lessons
    - Problem on a projectile moving vertically up and down
    - Problem on an arrow shot vertically upward
    - Problem on a ball thrown vertically up from the top of a tower
    - Problem on a toy rocket launched vertically up from a tall platform

Consider these lessons as your textbook,  handbook,  tutorials and  (free of charge)  home teacher.
Read them attentively and learn how to solve this type of problems once and for all.

Also,  you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook under the topic "Projectiles launched/thrown and moving vertically up and dawn".


Save the link to this online textbook together with its description

Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson

to your archive and use it when it is needed.