SOLUTION: Please help me solve this problem. A parabolic arch has a span of 80 feet and a maximum height of 78 feet. Choose a suitable rectangular coordinate system and find the equation of

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Please help me solve this problem. A parabolic arch has a span of 80 feet and a maximum height of 78 feet. Choose a suitable rectangular coordinate system and find the equation of      Log On


   

Question 1187061: Please help me solve this problem.
A parabolic arch has a span of 80 feet and a maximum height of 78 feet. Choose a suitable rectangular coordinate system and find the equation of the parabola.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
A parabolic arch has a span of 80 feet and a maximum height of 78 feet. Choose a suitable rectangular coordinate system and find the equation of the parabola.
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Parabolas have the form ax%5E2+%2B+bx+%2B+c+=+0
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Make the y-axis thru the vertex.
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Then you have 3 points:
(-40,0), (0,78) and (40,0)
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Can you do the rest?
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