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What is the simplified form of ( (a-b)^2-(a^2+b^2) )?

Answer and explanation

Correct answer: -2ab

Use the identity \((a-b)^2=a^2-2ab+b^2\). Thus, \((a-b)^2-(a^2+b^2)=(a^2-2ab+b^2)-a^2-b^2=-2ab\). Hence, the correct answer is \(-2ab\). The option \(0\) is obtained only in the special case \(ab=0\), not as the general simplified form. Exam tip: when subtracting an expression in brackets, distribute the negative sign to every term.

Related tags

Algebraic IdentitiesBinomial SquareAlgebraic SimplificationPolynomialsGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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