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What is the simplified form of ( (2x-5)(2x+5)+25 )?

Answer and explanation

Correct answer: \(4x^2\)

Use the identity \((a-b)(a+b)=a^2-b^2\). Here, \(a=2x\) and \(b=5\), so \((2x-5)(2x+5)=4x^2-25\). Adding \(25\) gives \(4x^2-25+25=4x^2\). The option \(4x^2+25\) incorrectly fails to cancel the \(-25\) with the outside \(+25\). Exam tip: When conjugate factors appear, apply the difference-of-squares identity first.

Related tags

Algebraic IdentitiesDifference Of SquaresPolynomial SimplificationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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