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Which option gives the correct simple interval for (-\sqrt{12}) on the number line?

Answer and explanation

Correct answer: ((-4,-3))

The direct answer is option A: \(-\sqrt{12}\) lies in \((-4,-3)\). Since \(9<12<16\), taking square roots gives \(3<\sqrt{12}<4\). Multiplying the whole inequality by \(-1\) reverses the signs: \(-3>-\sqrt{12}>-4\), which can be written as \(-4< -\sqrt{12}< -3\). Option A is correct. Option B, \((-3,-2)\), is too close to zero; the number is approximately \(-3.46\). Option C is positive, but \(-\sqrt{12}\) is negative. Option D, \((-5,-4)\), is too far left because the value is greater than \(-4\). Common mistake: when multiplying an inequality by a negative number, reverse its direction.

Related tags

PolynomialsNumber-LineNegative-SurdInterval

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