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If (x=2) and (y=1), what is the correct value of (2(x+y)^2-3xy)?

Answer and explanation

Correct answer: 12

On substituting the given values, x+y=2+1=3 and xy=2×1=2. Therefore, 2(x+y)^2-3xy=2(3)^2-3(2)=2×9-6=12. Option C, 18, is only the value of 2(3)^2; it does not subtract 3xy. Exam tip: evaluate brackets and powers before carrying out multiplication and subtraction.

Related tags

Algebraic ExpressionsSubstitutionOrder Of OperationsPolynomialsMathematics Grade 9Introduction To PolynomialsMathematicsClass 9 Mcq

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