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For (x=16) on the graph of (f(x)=\sqrt{x}), what is (y)?

Answer and explanation

Correct answer: (4)

The direct answer is option B: 4. The function rule is y=f(x)=\sqrt{x}. To find y when x=16, substitute 16 for x: y=\sqrt{16}=4 because 4×4=16. Thus the graph contains the point (16,4). Option A, 2, is wrong because 2×2=4, not 16. Option B, 4, is correct because its square is 16. Option C, 8, is wrong because 8×8=64. Option D, 16, is wrong because \sqrt{16} is 4, not 16; confusing x with y is a common mistake. Also, the square-root function has domain x≥0, and 16 is allowed. Its output is the nonnegative principal square root, so we choose 4 rather than −4. A useful exam cue is to ask, “Which nonnegative number multiplied by itself gives x?” For 16, that number is 4.

Related tags

Relations-FunctionsGraphsSquare-Root-Value

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