Chapter 9 Quadratic Relations and Conic Sections - 9.2 Graph and Write Equations of Parabolas - 9.2 Exercises - Skill Practice - Page 623: 3

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The equation in standard form: $y^2=16x$ Identify the focus, directrix, and axis of symmetry. The equation has the form $y^2=4px$ where $p=4 $. The focus is $(4, 0)$. The directrix is $x =-p=-4$. Because $y$ is squared, the axis of symmetry is the x-axis. Find some values: $x=1 \rightarrow y=\pm 4\\x=2 \rightarrow y=\pm 5.66\\x=3 \rightarrow y=\pm 6.93\\x=4 \rightarrow y=\pm 8\\x=5 \rightarrow y=\pm 8.94$