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For real numbers \(a\) and \(b\), which of the following expressions is always non-negative?

Answer and explanation

Correct answer: \((a-b)^2\)

\((a-b)^2\) is the square of a real number, so it is always zero or positive. In contrast, \(a^2-b^2\) can be negative; take \(a=1,b=2\). Exam tip: for “always” statements, look for a square form.

Related tags

Algebraic IdentitiesPerfect SquareNon-Negative ExpressionReal NumbersMathematics Class 9Exploring Algebraic IdentitiesMathematicsClass 9 Mcq

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