SOLUTION: Step by step, how do I write the standard form equation of a parabola with vertex at(0,0) and a focus of (0,-3)?

Question 747205: Step by step, how do I write the standard form equation of a parabola with vertex at(0,0) and a focus of (0,-3)?
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

given:
1) vertex (0,0)=(h,k) and focus (0,3)=(h,k+a)
standard equation: if vertex and focus have same coordinate, equation is

so, your equation is:

........since (0,3)=(h,k+a) => => =>

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