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What is the factorised form of (x^2-5x+6)?

Answer and explanation

Correct answer: ((x-2)(x-3))

For an expression of the form \(x^2+bx+c\), look for two numbers whose sum is \(b\) and whose product is \(c\). Here the middle coefficient is \(-5\), while the constant term is \(6\). Thus the required numbers must add to \(-5\) and multiply to \(6\). Both numbers must be negative because their product is positive and their sum is negative.

The numbers are \(-2\) and \(-3\). Therefore the factors are \( (x-2)(x-3) \). Expanding gives \(x^2-3x-2x+6=x^2-5x+6\), confirming choice B. Choices with plus signs give a positive middle coefficient, so they cannot match the expression.

Related tags

FactorisationQuadratic ExpressionMiddle Term

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