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What is the (xz)-term in \( (x+2y-3z)^2 \)?

Answer and explanation

Correct answer: \(-6xz\)

In the square of a trinomial, the product of each pair of distinct terms appears twice. From \(x\) and \(-3z\), we get \(2\times x\times(-3z)=-6xz\). Hence, the \(xz\)-term is \(-6xz\). The option \(-3xz\) misses the required factor of 2. Exam tip: while finding cross terms, include both \(2ab\) and the sign of each term.

Related tags

Algebraic IdentitiesTrinomial SquareCross TermsXz TermGrade 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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