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If (a+b=9) and (ab=14), what is the value of (3(a+b)-2ab)?

Answer and explanation

Correct answer: -1

Given (a+b)=9 and ab=14, substitute these directly into the expression: 3(a+b)-2ab=3(9)-2(14)=27-28=-1. The option 1 may result from an incorrect subtraction of 27-28. Exam tip: In such questions, there is no need to find a and b separately; directly use the given values of (a+b) and ab.

Related tags

Algebraic ExpressionsSubstitutionPolynomialsMathematicsClass 9Introduction To PolynomialsClass 9 Mcq

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