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What is the correct expansion of \\(x+8\\)^2?

Answer and explanation

Correct answer: \\(x^2+16x+64\\)

Apply the identity \\(a+b\\)^2=a^2+2ab+b^2\\). With \\(a=x\\) and \\(b=8\\), we get \\(x^2+2(x)(8)+8^2=x^2+16x+64\\). Option B omits the middle term, while option C uses an incorrect coefficient for it. In an exam, always check that the middle term is \\(2ab\\).

Related tags

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

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