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The factors of (x^2+bx+24) are ((x+4)(x+6)). What is the value of (b)?

Answer and explanation

Correct answer: (10)

When two linear factors have the form \((x+r)(x+s)\), their product is \(x^2+(r+s)x+rs\). Here the stated factors are \((x+4)(x+6)\). The constant terms multiply to \(4\times6=24\), matching the last term, and the middle coefficient is the sum \(4+6=10\). Therefore the value of \(b\) is 10, which is option D.

Expanding makes the conclusion clear: \((x+4)(x+6)=x^2+6x+4x+24=x^2+10x+24\). Comparing this with \(x^2+bx+24\) gives \(b=10\). Option A is the constant term rather than the middle coefficient, while options B and C are only one of the two contributing numbers. The important method is to add the constants in the two binomials to find the coefficient of \(x\).

Related tags

Unknown CoefficientFactorsQuadratic Expression

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