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College Algebra & Trigonometry, 2018a

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270 CHAPTER 5. CONIC SECTIONS - CIRCLE AND PARABOLA<br />

If the two sides have opposite signs, then the parabola will open to the left.<br />

Directrix: x = h − p<br />

Focus: (h + p, k)<br />

Vertex: (h, k)<br />

p

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