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What is the simplified form of ( (x+4)^2-(x-4)^2 )?

Answer and explanation

Correct answer: \(16x\)

Use the identity \((a+b)^2-(a-b)^2=4ab\). Here, \(a=x\) and \(b=4\), so the expression becomes \(4\times x\times 4=16x\). The result \(8x\) would arise if \(b=2\). Exam tip: Recognise the difference-of-squares identity to simplify such expressions quickly instead of expanding both squares.

Related tags

Algebraic IdentitiesBinomial SquaresDifference Of SquaresExpression SimplificationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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