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

Answer and explanation

Correct answer: \(2x^2-30\)

\((x+5)(x-3)=x^2+2x-15\) and \((x-5)(x+3)=x^2-2x-15\). On adding, \(+2x\) and \(-2x\) cancel, giving \(2x^2-30\). \(2x^2+30\) results from incorrectly adding the constant terms. Exam tip: expand each product separately before combining like terms.

Related tags

Algebraic IdentitiesPolynomial ExpansionLike TermsAlgebraic SimplificationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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