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Which of the following quadratic trinomials is a perfect square, that is, it can be written as the product of two identical binomials?

Answer and explanation

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

Here \(a=1, b=10, c=25\), and \(b^2=100=4ac\); hence \(x^2+10x+25=(x+5)^2\), a perfect square. Exam tip: halve the middle-term coefficient and square it.

Related tags

Quadratic ExpressionsPerfect Square TrinomialAlgebraic IdentitiesFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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