Question

In Exercises 51–54, graph the given square root functions, f and g, in the same rectangular coordinate system. Use the integer values of x given to the right of each function to obtain ordered pairs. Because only nonnegative numbers have square roots that are real numbers, be sure that each graph appears only for values of x that cause the expression under the radical sign to be greater than or equal to zero. Once you have obtained your graphs, describe how the graph of g is related to the graph of f. f(x) = √x (x = 0, 1, 4, 9) and g (x) = √(x + 2) (x = = −2, −1, 2, 7)

Accepted Answer

Identify the domain of each function by determining the values of x for which the expression under the square root is nonnegative. For $$ f(x) = \sqrt{x} $$, the domain is $$ x \geq 0 . $$For $$ g(x) = \sqrt{x + 2} $$, the domain is $$ x + 2 \geq 0 $$, which simplifies to $$ x \geq -2 . $$Create ordered pairs for $$ f(x) = \sqrt{x} $$ using the given x-values $$ 0, 1, 4, 9 . $$Calculate each $$ f(x)  by $$taking the square root of x, resulting in points $$ (0, \sqrt{0}), (1, \sqrt{1}), (4, \sqrt{4}), (9, \sqrt{9}) . $$Create ordered pairs for $$ g(x) = \sqrt{x + 2} $$ using the given x-values $$ -2, -1, 2, 7 . $$Calculate each $$ g(x)  by $$taking the square root of $$ x + 2 $$, resulting in points $$ (-2, \sqrt{0}), (-1, \sqrt{1}), (2, \sqrt{4}), (7, \sqrt{9}) . $$Plot the points for both functions on the same coordinate system. For $$ f(x) $$, plot points where x is nonnegative, and for $$ g(x) $$, plot points starting from $$ x = -2 $$ onwards. Connect the points smoothly, remembering that square root functions produce curves that increase but at a decreasing rate. Compare the graphs of $$ f $$ and $$ g . $$Notice that $$ g(x) = \sqrt{x + 2} $$ can be seen as a horizontal shift of $$ f(x) = \sqrt{x}  to $$the left by 2 units, because adding 2 inside the square root moves the graph left along the x-axis.

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Concetti chiave

Domain of Square Root Functions

Graphing Square Root Functions Using Ordered Pairs

Transformations of Functions: Horizontal Shifts