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What is the coefficient of (x) in ( (x+a)(x+b) )?

Answer and explanation

Correct answer: (a+b)

A coefficient is the number or algebraic expression that multiplies a particular variable term. First expand the product using the distributive property: \\( (x+a)(x+b)=x\cdot x+x\cdot b+a\cdot x+a\cdot b\\). This gives \\(x^2+bx+ax+ab\\). Combining the two terms containing x gives \\(x^2+(a+b)x+ab\\). Therefore, the coefficient of x is \\(a+b\\), so option C is correct.

It is important to identify the term, not just any expression in the expansion. The coefficient of \\(x^2\\) is 1, and the constant term is \\(ab\\), but neither is the coefficient of x. The two contributions to the x-term are \\(bx\\) and \\(ax\\); adding them produces \\((a+b)x\\). This reasoning works for arbitrary values of a and b, including zero or negative values. Hence the third choice gives the required coefficient.

Related tags

General IdentityCoefficientBinomial Product

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