The TI-84 Plus C graphing calculator not only helps you make graphs, but its Zoom commands also help you highlight specific areas of a graph, redraw graphs in certain ratios, and otherwise tweak graphs to suit your needs. The following list shows you what each Zoom command does:
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ZBox: Draws a box around a portion of the graph and redraws the graph in a viewing window that has the dimensions of the box.
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Zoom In: Zooms in on the graph at the location of the cursor.
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Zoom Out: Zooms out on the graph at the location of the cursor.
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ZDecimal: Draws the graph in a –6.6 ≤ x ≤ 6.6 and –4.1 ≤ y ≤ 4.1 window. When the graph is traced, the x-coordinate of the Trace cursor equals an integral multiple of 0.1.
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ZSquare: Redraws the graph in a window that makes circles look like circles instead of ellipses.
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ZStandard: Draws the graph in a –10 ≤ x ≤ 10, –10 ≤ y ≤ 10 window.
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ZTrig: Draws the graph in a –11π/4 ≤ x ≤ 11π/4 and –4 ≤ y ≤ 4 window. When the graph is traced, the x-coordinate of the Trace cursor equals an integral multiple of π/24.
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ZInteger: Redraws the graph so that when it is traced, the x-coordinate of the Trace cursor equals an integer.
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ZoomStat: Finds an appropriate viewing window for stat plots.
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ZoomFit: Finds an appropriate viewing window for graphing functions, parametric equations, polar equations, or sequences.
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ZQuadrant1: This command graphs your function in a preset viewing window where 0 ≤ x ≤ 13.2 and 0 ≤ y ≤ 13.2. When you trace a function graphed in this window, the x-coordinate of the Trace cursor will be a multiple of 0.1.
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ZFrac1/2: This command graphs your function in a preset viewing window where –66/2 ≤ x ≤ 66/2 and –41/2 ≤ y ≤ 41/2. When you trace a function graphed in this window, the x-coordinate of the Trace cursor will be a multiple of 1/2.
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ZFrac1/3, ZFrac 1/4, ZFrac1/5, ZFrac 1/8, ZFrac1/10: These commands graph your function in a preset viewing window and work in the same manner as ZFrac1/2 does. If you think of d as the denominator of your fraction, then the viewing window is –66/d ≤ x ≤ 66/d and –41/d ≤ y ≤ 41/d. Tracing with these commands let you trace the x-coordinates by multiples of 1/d.
