## Questions and Answers for Quadratic Formula

Quadratic Formula

### A projectile is thrown upward so that its distance above the ground after t secondes is h=-12t^2+432t. After how...

If you have quadratic function (parabola) `f(x)=ax^2+bx+c` where `a<0` (as in your case) its maximum value will be `-(b^2-4ac)/(4a)` (that is the height of vertex of parabola), and that maximum...

Quadratic Formula

### A coin is thrown horizontally with a speed of 12m/s from the top of a bridge. If the coin strikes the sea water below...

We are given the initial speed of the coin and the time it took before it hit the water. The given initial speed is the horizontal speed -- that is, the horizontal component of the initial speed....

Quadratic Formula

### When a ball is thrown into the air, its height depends on the time since the ball was thrown. The equation for its...

Take note that the equation is in the form h(t) = at^2 +bt + c. Here, a < 0 so the parabola opens upward. Therefore, the maximum height can be found on the ordinate of the vertex. We will...