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What is the simplified form of ( (x+5)(x-3)-(x-5)(x+3) )?

Answer and explanation

Correct answer: \(4x\)

Expanding the first product gives \((x+5)(x-3)=x^2+2x-15\). Similarly, \((x-5)(x+3)=x^2-2x-15\). Subtracting the second expression gives \(x^2+2x-15-(x^2-2x-15)=4x\). Hence, the correct answer is \(4x\). The option \(8x\) may result from handling the negative signs while subtracting incorrectly. Exam tip: when a minus sign precedes brackets, change the sign of every term inside the brackets.

Related tags

Algebraic IdentitiesAlgebraic SimplificationPolynomial ExpansionSubtraction Of PolynomialsLinear ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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