Chapter 9 Quadratic Relations and Conic Sections - 9.2 Graph and Write Equations of Parabolas - 9.2 Exercises - Skill Practice - Page 623: 5

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The equation in standard form: $x^2=20y$ Identify the focus, directrix, and axis of symmetry. The equation has the form $x^2=4py$ where $p=5$. The focus is $(0,5)$. The directrix is $x =-p=-5$. Because $y$ is squared, the axis of symmetry is the x-axis. Find some values and plot points: $x=1 \rightarrow y=\pm 4.47\\x=2 \rightarrow y=\pm 6.32\\x=3 \rightarrow y=\pm 7.75\\x=4 \rightarrow y=\pm 8.94\\x=5 \rightarrow y=\pm 10$