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What is the full expansion of ( (x+3)(x+5)(x+7) )?

Answer and explanation

Correct answer: (x^3+15x^2+71x+105)

The expression is a product of three linear factors. Its complete expansion must contain a cubic term, a squared term, a linear term, and a constant term. The safest method is to multiply two factors first and then use distribution carefully. This also helps prevent missing a middle term or placing a coefficient with the wrong power of x.

First, \(x+3)(x+5)=x^2+8x+15\). Now multiply by \(x+7\): \(x^2(x+7)+8x(x+7)+15(x+7)\), which gives \(x^3+7x^2+8x^2+56x+15x+105\). Combining like terms gives \(x^3+15x^2+71x+105\). Therefore option A is correct. Option B misses part of the squared coefficient, while C and D omit or interchange terms.

Related tags

Three FactorsPolynomial ExpansionExpert

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