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Home > AC > Chapter 12 > Lesson 12.4.2 > Problem 12-80


If a tile pattern can be described by the equation , where represents the figure number and represents the number of tiles, find each of the following.

  1. The number of tiles in Figure 211.

  2. The number of the figure that contains tiles.

Substitute into the equation for .

Substitute into the equation for .

Set the equation equal to zero.

Factor the expression.


The figure number cannot be negative.