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If (k=3), what is the value of (2(k+4)-k^2)?

Answer and explanation

Correct answer: 5

Substituting k=3 gives 2(3+4)-3^2. The bracket equals 7, so 2×7=14, and 3^2=9. Therefore, 14-9=5, so 5 is correct. The value 14 is only the result of the multiplication part; 9 still has to be subtracted. Exam tip: after substitution, evaluate brackets, powers, multiplication, and then subtraction in order.

Related tags

Algebraic ExpressionsSubstitutionOrder Of OperationsExponentsPolynomialsIntroduction To PolynomialsMathematicsClass 9 Mcq

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