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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.

    Substitute into the equation for .

  2. The number of the figure that contains tiles.

    Substitute into the equation for .

    Set the equation equal to zero.

    Factor the expression.


    The figure number cannot be negative.