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Class 9MathematicsExploring Algebraic IdentitiesQuadratic expressionsHard
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For which (k) will (x^2+kx+9) be a perfect square with negative middle term?

Answer and explanation

Correct answer: (-6)

Since (9=3^2), the negative middle term is (-2\cdot3\cdot x=-6x). Exam tip: match the sign of the middle term with the condition.

Related tags

Unknown CoefficientPerfect SquareNegative TermQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq
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  10. 10Which of the following quadratic expressions can be factorised using the identity for the difference of two squares?
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