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What will be the coefficient of (x) in ( (x+4)(x+6) )?

Answer and explanation

Correct answer: (10)

The direct answer is option A: the coefficient of \(x\) is 10. Multiply each term in the first bracket by each term in the second bracket: \((x+4)(x+6)=x\cdot x+x\\cdot6+4\cdot x+4\cdot6\). This gives \(x^2+6x+4x+24=x^2+10x+24\). The coefficient is the number multiplying \(x\), so it is 10. Equivalently, the linear coefficient comes from adding the constants 4 and 6. Option A is correct. Option B, 24, is the constant term because it comes from \(4\cdot6\), not the coefficient of \(x\). Option C, 4, is only one contribution to the linear term. Option D, 6, is the other contribution, but both contributions must be added. Do not confuse a term with its coefficient: in \(10x\), the coefficient is 10, while 10x is the complete term. Memory cue: for \((x+p)(x+q)\), the middle coefficient is \(p+q\), and the constant term is \(pq\).

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Product IdentityCoefficientX Plus Numbers

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