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Which algebraic identity gives the expansion \(x^2+2x+1\)?

Answer and explanation

Correct answer: \((x+1)^2\)

Using the identity \((a+b)^2=a^2+2ab+b^2\) with \(a=x\) and \(b=1\), we get \((x+1)^2=x^2+2x+1\). Therefore, option A is correct. Option B has the middle term \(-2x\), while option C gives \(x^2-1\). In exams, match the sign and coefficient of the middle term first.

Related tags

AlgebraAlgebraic IdentitiesPerfect SquareBinomial ExpansionGeneral Chapter PracticeCommon QuestionsCommonMathematics

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