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

Answer and explanation

Correct answer: 12

Substituting the given values, x+y=2+1=3. Therefore, 2(x+y)^2-3xy=2(3)^2-3(2)(1)=2×9-6=18-6=12. Hence, the correct answer is 12. The value 18 is only the first term, 2(x+y)^2; the term 3xy must also be subtracted. Exam tip: evaluate brackets first, then powers and multiplication, and finally addition or subtraction.

Related tags

Algebraic ExpressionsSubstitutionOrder Of OperationsPolynomial EvaluationClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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