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Which is the expansion of ( (x+4)(x-9) )?

Answer and explanation

Correct answer: \(x^2-5x-36\)

Using the distributive property, \((x+4)(x-9)=x^2-9x+4x-36=x^2-5x-36\). Therefore, option A is correct. In option B, the sign of the middle term is incorrect because \(-9x+4x=-5x\), not \(+5x\). Exam tip: multiply the first, outer, inner and last terms, then combine like terms.

Related tags

Algebraic IdentitiesBinomial MultiplicationPolynomial ExpansionDistributive PropertyLinear TermsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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