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What are the factors of (10x^2+31x+24)?

Answer and explanation

Correct answer: ((2x+3)(5x+8))

The expression is a quadratic trinomial. To factor it, we need two binomials whose first terms multiply to give the leading term, whose last terms multiply to give the constant term, and whose cross-products add to the middle term. This is a useful way to check every proposed factorisation rather than relying only on appearance.

For choice A, expand \((2x+3)(5x+8)\). The products are \(10x^2\), \(16x\), \(15x\), and \(24\). The middle terms add to \(31x\), so the result is exactly \(10x^2+31x+24\). Therefore A is correct. The other choices do not produce the required middle coefficient or constant term.

Related tags

Quadratic FactorisationMiddle TermExpert

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