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What is the full expansion of ( (x+2)(x+4)(x+6) )?

Answer and explanation

Correct answer: (x^3+12x^2+44x+48)

The direct answer is option A: \(x^3+12x^2+44x+48\). Start by multiplying the first two factors: \((x+2)(x+4)=x^2+6x+8\). Now multiply by \((x+6)\): \(x^2(x+6)+6x(x+6)+8(x+6)=x^3+6x^2+6x^2+36x+8x+48\). Combining like terms gives \(x^3+12x^2+44x+48\). Option A is correct because it includes every product and combines the terms correctly. Option B has \(10x^2\), but the two contributions to the squared term are \(6x^2+6x^2=12x^2\). Option C misses the \(x^2\) term and has an incorrect linear term. Option D places the coefficients of \(x^2\) and \(x\) incorrectly. Multiply in two stages and collect like powers carefully. Memory cue: the constant term is \(2\cdot4\cdot6=48\), and the coefficient of \(x^2\) is \(2+4+6=12\).

Related tags

Three FactorsFull ExpansionPolynomial

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