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How will you split the middle term in (2x^2+5x+2)?

Answer and explanation

Correct answer: (x+4x)

To split the middle term of \(2x^2+5x+2\), multiply the leading coefficient and constant term: \(2\cdot2=4\). We need two numbers whose product is 4 and whose sum is 5. Those numbers are 1 and 4. Therefore the middle term \(5x\) is written as \(x+4x\), giving \(2x^2+x+4x+2\).

This split is useful because it allows grouping: \(2x^2+x+4x+2=x(2x+1)+2(2x+1)=(x+2)(2x+1)\). Hence option B correctly describes the split. Option A gives \(2x+3x=5x\), but the associated numbers 2 and 3 have product 6, not the required product 4, so that split would not support correct grouping.

Related tags

Quadratic ExpressionsMiddle TermSplitting

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