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What is the correct factorised form of \(6x^2+17x+12\)?

Answer and explanation

Correct answer: \((2x+3)(3x+4)\)

The direct answer is A: \((2x+3)(3x+4)\). Expand it carefully: the first terms give \(2x\cdot3x=6x^2\), the cross-products give \(2x\cdot4=8x\) and \(3\cdot3x=9x\), and the last terms give \(3\cdot4=12\). Adding the cross-products gives \(8x+9x=17x\), so the expansion is exactly \(6x^2+17x+12\). Option B gives \(6x^2+27x+12\), because its cross-products are 24x and 3x. Option C gives \(6x^2+14x+12\). Option D gives \(6x^2+22x+12\). Thus only A matches the leading term, middle term, and constant term simultaneously. For \((px+q)(rx+s)\), remember that the middle coefficient comes from \(ps+qr\), not from just one cross-product.

Related tags

FactorisationQuadratic ExpressionsMiddle-Term VerificationExpansionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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