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What is the coefficient of (x^2) in ( (2x-5)^2 )?

Answer and explanation

Correct answer: 4

Use the identity \((a-b)^2=a^2-2ab+b^2\). Here, \(a=2x\) and \(b=5\), so \((2x-5)^2=4x^2-20x+25\). Therefore, the coefficient of \(x^2\) is 4. Note that 20 is associated with the middle term, \(-20x\), not with \(x^2\). Exam tip: always check the power of the variable before identifying a coefficient.

Related tags

Algebraic IdentitiesBinomial SquareCoefficientQuadratic ExpressionGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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