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Which option is correct about ( \sqrt{32} )?

Answer and explanation

Correct answer: It is irrational

The direct answer is option B: √32 is irrational. To understand this, simplify the radical: 32 = 16 × 2, so √32 = √16 × √2 = 4√2. The square root of 2 is irrational, meaning it cannot be written as a fraction of two integers. Therefore 4√2 is also irrational. Another quick test is that 32 is not a perfect square. The perfect squares near it are 25 and 36; their square roots are 5 and 6. Since 32 lies between them, √32 lies between 5 and 6 and is not an integer. Option A, rational, is wrong because √32 cannot be expressed as a terminating or recurring rational decimal. Option B is correct because the simplified form still contains √2. Option C, 16, is wrong because the square root of 32 is not 16; in fact, 16² = 256. Option D, 8, is wrong because 8² = 64, not 32. The exact value is approximately 5.657, not 8 or 16. Memory cue: first remove any square factor, then check whether a non-square radical remains; if it does, the result is irrational.

Related tags

Number-SystemsIrrational-NumbersSquare-Root

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