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If \(a\) and \(b\) are real numbers, what is the value of \(\sqrt{(a-b)^2}\)?

Answer and explanation

Correct answer: \(|a-b|\)

\(\sqrt{x^2}=|x|\) because the principal square root is always non-negative. Taking \(x=a-b\), we get \(\sqrt{(a-b)^2}=|a-b|\). The expression \(a-b\) is correct only when \(a\ge b\); if \(a<b\), it is negative. Exam tip: whenever a squared expression comes out of a square root, remember to use absolute value signs.

Related tags

Real NumbersSquare RootsAbsolute ValueAlgebraic ExpressionsNumber SystemsMathematicsClass 9 Mcq

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