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Beginning Pre-Calculus for Game Developers by Boris Meltreger, John P. Flynt

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Roots

For rational numbers, the use of radicals restricts the output to positive values, as Figure 10.20 reveals. However, if you multiply the extracted root by a negative number, such as –1, then you reverse the values that result so that the curve of the graph falls below the x axis.

Figure 10.20. Multiplying the root by a negative flips the graph of the root.

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