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Factorise \(x^2+3x+2\).

Answer and explanation

Correct answer: \((x+1)(x+2)\)

The direct answer is A: \((x+1)(x+2)\). For a monic quadratic of the form \(x^2+bx+c\), find two numbers whose sum is b and whose product is c. Here the required sum is 3 and the required product is 2. The numbers 1 and 2 satisfy both conditions, so \(x^2+3x+2=(x+1)(x+2)\). Verify by multiplication: \(x\cdot x=x^2\), the cross terms are \(2x+x=3x\), and the constant product is \(1
times2=2\). Option B gives \(x^2+5x+6\), so both the middle and final terms are wrong. Option C gives \(x^2-3x+2\), with the wrong sign in the middle term. Option D gives \(x^2+4x+3\), so its sum and product do not match. The safest method is to multiply each proposed pair back out. Memory cue: for \(x^2+bx+c\), the two constants must add to b and multiply to c.

Related tags

Trinomial FactorisationMiddle-Term SplittingQuadratic ExpressionsClass 9 MathematicsFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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