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What is the correct expansion of \\((x-9)^2\\)?

Answer and explanation

Correct answer: \\(x^2-18x+81\\)

Use the identity \\((a-b)^2=a^2-2ab+b^2\\). Here, \\(a=x\\) and \\(b=9\\), so \\(x^2-2(x)(9)+9^2=x^2-18x+81\\). Option B has the wrong sign in the middle term because this is the square of a difference, not a sum. In an exam, remember that the middle term in \\((a-b)^2\\) is always \\(-2ab\\).

Related tags

PolynomialsAlgebraic IdentitiesSquare Of DifferenceExpansionOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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