SOLUTION: How do you determine the focus and directrix from the vertex formula y-k=a(x-h)^2 ?

SOLUTION: How do you determine the focus and directrix from the vertex formula y-k=a(x-h)^2 ?

Algebra.Com

Question 358067: How do you determine the focus and directrix from the vertex formula
y-k=a(x-h)^2 ?
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
a = 1/(4p) ___ where p is the distance from the vertex to the focus (which are both on the axis of symmetry)

p is also the distance from the directrix to the vertex (the directrix is perpendicular to the axis of symmetry)
RELATED QUESTIONS
How do you find the focus, directrix, and vertex of the formula : x^2+8y=0... (answered by lwsshak3)

Hi! I have a problem that asks: "Find the focus and directrix of the parabola from the... (answered by lwsshak3)

how do you identify the vertex, focus, and directrix of the parabola y=x^2+4x+3 And... (answered by stanbon)

Compared to the focus and directrix of y = ax^2, explain how the focus and directrix of (answered by stanbon)

When given the coordinates (3,8) how do you know which number is substituted when solving (answered by stanbon)

How do you find the vertex, focus, and directrix in this formula? 4y^2+3x-16y+19=0 I'm... (answered by richwmiller)

How do you graph the parabola of -12(x+3)=(y-3)^2 that includes the directrix and focus... (answered by MathLover1)

How do I find the vertex and focus and directrix of... (answered by josgarithmetic)

Can you please help. (33) Find the vertex, focus, and directrix of the graph of the... (answered by Nate)