A building has an entry the shape of a parabolic arch 84 ft high and 42 ft wide at the base as shown below.
Find an equation for the parabola if the vertex is put at the origin of the coordinate system.
y2 = -21x

x2 = -21y

x2 = -5.3y

y2 = -5.3x

Question

A building has an entry the shape of a parabolic arch 84 ft high and 42 ft wide at the base as shown below. 
Find an equation for the parabola if the vertex is put at the origin of the coordinate system.
y2 = -21x

 x2 = -21y

 x2 = -5.3y

 y2 = -5.3x

goformit100 · Answer

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goformit100 · Answer

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anonymous · Answer

hi, this is a question that leads to your basic functions, and transformations

y=x^2 is your basic parabola function

i will draw it out and help

anonymous · Answer

|dw:1382323756605:dw|

anonymous · Answer

and for this transformation, we will multiply x^2 by -1 to get an inverse shape
|dw:1382323833855:dw|