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What is the expansion of ((3x+2)(x-5))?

Answer and explanation

Correct answer: (3x^2-13x-10)

Direct answer: option C, \(3x^2-13x-10\). Apply distribution: multiply \(3x\) by \(x\) to get \(3x^2\), and \(3x\) by \(-5\) to get \(-15x\). Then multiply \(2\) by \(x\) to get \(2x\), and \(2\) by \(-5\) to get \(-10\). The expanded expression is \(3x^2-15x+2x-10\). Combine like terms: \(-15x+2x=-13x\), giving \(3x^2-13x-10\). Option A stops before combining like terms, so it is an unsimplified intermediate step, not the requested simplified expansion. Option B has the wrong sign for \(3x\times(-5)\). Option C is correct. Option D has \(+13x\), so it has sign errors. Memory cue: use all four products and track the negative sign.

Related tags

Binomial ProductQuadratic ExpansionLike Terms

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