Chapter 9 Quadratic Relations and Conic Sections - 9.2 Graph and Write Equations of Parabolas - 9.2 Exercises - Skill Practice - Page 623: 6

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The equation in standard form: $y^2=28x$ Identify the focus, directrix, and axis of symmetry. The equation has the form $y^2=4px$ where $p=7$. The focus is $(7,0)$. The directrix is $x =-p=-7$. Because $y$ is squared, the axis of symmetry is the x-axis. Find some values and plot points: $x=1 \rightarrow y=\pm 5.29\\x=2 \rightarrow y=\pm 7.48\\x=3 \rightarrow y=\pm 9.17\\x=4 \rightarrow y=\pm 10.58\\x=5 \rightarrow y=\pm 11.83$