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What is the midpoint of (-\sqrt{4}) and (\sqrt{16}) on the number line?

Answer and explanation

Correct answer: (1)

The direct answer is option B, 1. First simplify the endpoints: \(-\sqrt{4}=-2\), because the negative sign is outside the principal square root, and \(\sqrt{16}=4\). The midpoint of two numbers \(a\) and \(b\) is \(\frac{a+b}{2}\). Hence \(\frac{-2+4}{2}=\frac{2}{2}=1\). Option A, 0, would be the midpoint of -2 and 2, not -2 and 4. Option B, 1, is exactly halfway: it is 3 units from -2 and 3 units from 4. Option C, 2, is closer to 4 and is not halfway. Option D, 3, is also closer to 4. A common error is to treat \(-\sqrt{4}\) as positive; the minus sign must remain, so the endpoint is -2. Exam cue: simplify first, then average the two coordinates.

Related tags

Number-LineMidpointRootsAverage

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