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How will (x^2+2x+5) be written as a square plus a constant?

Answer and explanation

Correct answer: \((x+1)^2+4\)

First complete the square for \(x^2+2x\). Since \(x^2+2x+1=(x+1)^2\), we get \(x^2+2x+5=x^2+2x+1+4=(x+1)^2+4\). Therefore, option A is correct. Expanding option C gives a middle term of \(-2x\), so it cannot match the given expression. Exam tip: use the identity \(x^2+2ax+a^2=(x+a)^2\).

Related tags

Completing The SquareQuadratic ExpressionsAlgebraic IdentitiesGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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