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What is the coefficient of (x) in ( (2x+1)(2x+7) )?

Answer and explanation

Correct answer: 16

Expanding \((2x+1)(2x+7)\) gives \(4x^2+14x+2x+7=4x^2+16x+7\). Therefore, the coefficient of \(x\) is \(16\). The value \(14\) comes only from \(2x\times 7\); the term \(1\times 2x=2x\) must also be included. Exam tip: combine all like \(x\)-terms before identifying the coefficient.

Related tags

Algebraic IdentitiesBinomial MultiplicationCoefficientExpansionLike TermsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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