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Which of the following trinomials can be written in the form \((x+5)^2\)?

Answer and explanation

Correct answer: \(x^2+10x+25\)

Using \((a+b)^2=a^2+2ab+b^2\), put \(a=x\) and \(b=5\). The middle term is \(2\times x\times5=10x\), and the last term is \(25\). Hence A is a perfect-square trinomial. Exam tip: check whether the middle coefficient is twice the product of the terms.

Related tags

Algebraic IdentitiesPerfect Square TrinomialBinomial SquareClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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