Key Maths Vocabulary
What is the Quadratic Formula?
and this…………….
Brenda (BLUE): h= -5t² +15t +18
Where t is measured in seconds and h is measure in meters.
Regina (RED): h= -16x² +40t +56
where t is measured in seconds and h is measured in feet.
1. Discuss the Y-intercept for each quadratic equation (Use the key word: height).
2.Explain how to find the x-intercepts (roots) of the graph of a quadratic function by graphing,factoring, or using the quadratic formula. In general, what do the x-intercepts of a quadratic mean? How many x-intercepts can a quadratic function have?
3. Analyze the path of each of the rockets: Use math and science vocabulary words such as axis of symmetry, vertex, opens up/down, maximum height, and gravity.
4. Use your great algebra skills to determine whose rocket stays in the air the longest. Explain how you used the graph to answer the question.
>>What is the Quadratic Formula?
You DO know that yahoo.com is a search engine, right? Go here to learn it:
http://www.purplemath.com/modules/solvquad4.htm
1) The y-intercept is where it crosses the y-axis. Or here, the h-axis. This happens when t=0. So plug in t=0 to see what the y-intercepts are, then think of what this means in light of the problem.
2) Go here to learn:
http://www.purplemath.com/modules/solvquad.htm
http://www.purplemath.com/modules/solvquad4.htm
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