Find an Equation of the Parabola Described $x ^ { 2 } = 84 y$

question 22

Multiple Choice

Find an equation of the parabola described.
-Focus at (0, 21) ; directrix the line y = -21

• A) \(x ^ { 2 } = 84 y\)
• B) \(y ^ { 2 } = 84 x\)
• C) \(y ^ { 2 } = 21 x\)
• D) \(x ^ { 2 } = - 84 y\)

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