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What is the value of ( (5x+1)^2-(5x-1)^2 )?

Answer and explanation

Correct answer: \(20x\)

Apply the identity \((a+b)^2-(a-b)^2=4ab\). Here, \(a=5x\) and \(b=1\). Therefore, the value is \(4\times 5x\times 1=20x\). The expression \(25x^2-1\) is the value of \((5x+1)(5x-1)\), not the difference of the two squares. Exam tip: Recognise the \(4ab\) identity to avoid unnecessary expansion.

Related tags

Algebraic IdentitiesDifference Of SquaresBinomial SquaresGrade 9 MathematicsSimplificationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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