9-6A Solving Quadratic Eq.’s with Quadratic Formula Algebra 1

Quadratic Formula

Use the Quadratic Formula When you can’t factor a trinomial.

Identify the a, b & c ax + bx + c = 0 Standard Form For example, find 2x + 7x – 15 = 0 a= b= c=

Example 1 2x + 7x – 15 = 0

Example 2 Writing in Standard Form 1 st 3n - 8n = 2

Assignment

Example 3 -Finding the x-intercepts of a graph

Vertical Motion Models Object is dropped: Object is thrown: h=height(ft) t=time in motion(seconds s=initial height (ft) v=initial velocity (ft/sec)

Example 4 – Modeling Vertical Motion Six balloonists compete in the Field Target Event at a hot-air balloon festival. Calculate the amount of time it takes for the marker to hit the target when thrown down from the given initial height (in feet) with the given initial velocity (in feet per second); s=200;v=-50