Algebra
Quadratic Equations
What is the root of the quadratic equation
\[x^2 + 6 x +9 = 0?\]
What are the roots of the quadratic equation
\[x^2 -2 x -48 = 0?\]
What are the roots of the quadratic equation
\[x^2 - 2 x -5 = 0?\]
From the top of a building of 960 feet, Tommy threw a coin upwards. The height of the coin from the ground \(t\) seconds after it has been thrown is given by
\[ h = - 16t^2 + 8 t + 960. \]
How long (in seconds) would it take the coin to hit the ground?
What are the roots of the quadratic equation
\[0.5x^2 + 0.6 x -0.2 = 0?\]