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Graphing Radical Functions

Graphing Radical Functions 1.9 - Solution

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The function y=-2xy=\text{-}2\sqrt{x} is a radical function with an even index. Since the function doesn't have any added/subtracted constant, it will start on the xx-axis where y=0.y=0. The radicand will always give a positive answer and since the coefficient is negative the yy-values will only be negative.

Thus, the range is y0. y \leq 0.