anonymous
  • anonymous
The vertex of this parabola is at (-2, 5). Which of the following could be its equation? A. y = 3(x - 2)2 - 5 B. y = 3(x - 2)2 + 5 C. y = 3(x + 2)2 + 5 D. y = 3(x + 2)2 - 5
Geometry
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
What i do is go to https://www.desmos.com/calculator and put in each of the equations. I know theres a trick to finding the answer without graphing, but i cant remember it
anonymous
  • anonymous
I don't understand website you give me but thank you anyways.
whpalmer4
  • whpalmer4
Vertex formula for a parabola is: \[y = (x-h)^2 + k\] where the vertex is at \((h,k)\)

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whpalmer4
  • whpalmer4
You know the vertex, so plug that into the formula and compare notes. Sorry, that should be \[y = a(x-h)^2 + k\]where \(a\) is a constant that will equal \(3\) in this case.
whpalmer4
  • whpalmer4
There are an infinite number of parabolas with the same vertex, so the value of \(a\) selects which one you get.

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