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If (a+b=8) and (ab=12), what is the value of (4(a+b)-ab)?

Answer and explanation

Correct answer: 20

Given \(a+b=8\) and \(ab=12\), substitute these values into \(4(a+b)-ab\): \(4\times 8-12=32-12=20\). Hence, the correct answer is 20. The value 32 is only \(4(a+b)\); subtracting \(ab\) is still necessary. Exam tip: substitute the given combined expressions such as \(a+b\) and \(ab\) directly.

Related tags

Algebraic ExpressionsSubstitutionEvaluating ExpressionsPolynomialsClass 9 MathematicsIntroduction To PolynomialsMathematicsClass 9 Mcq

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