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What are the factors of (3x^2+10x+8)?

Answer and explanation

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

The direct answer is A: $(3x+4)(x+2)$. Use the split-middle-term method. Multiply the first and last coefficients: $3×8=24$. Two numbers with product 24 and sum 10 are 6 and 4. Thus $3x^2+10x+8=3x^2+6x+4x+8$. Group the terms: $3x(x+2)+4(x+2)$. The common factor is $x+2$, giving $(3x+4)(x+2)$. Expanding A returns $3x^2+6x+4x+8=3x^2+10x+8$. B expands to $3x^2+14x+8$, so its middle term is too large. C expands to $x^2+10x+24$, changing the leading and constant terms. D expands to $3x^2-10x+8$, changing the sign of the middle term. The memory cue is: for $ax^2+bx+c$, first inspect $ac$, then split $bx$ into two terms that can be grouped with a common binomial.

Related tags

Quadratic FactorisationGroupingSplit Middle TermFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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