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If (x^2+x=20), what is the value of (3x^2+3x-4)?

Answer and explanation

Correct answer: 56

Given \(x^2+x=20\). Taking 3 common from the first two terms, \(3x^2+3x-4=3(x^2+x)-4\). Substituting the given value gives \(3(20)-4=60-4=56\). Therefore, 56 is correct. Option 60 is a close distractor because it results from forgetting to subtract 4. Exam tip: Rewrite the expression to contain the exact group given in the question before substituting.

Related tags

Algebraic ExpressionsPolynomialsSubstitutionCommon FactorExpression EvaluationIntroduction To PolynomialsMathematicsClass 9 Mcq

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