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If (S(x)=s-9x) and (S(4)-S(12)=72), which conclusion is correct?

Answer and explanation

Correct answer: The condition is true for every real \(s\)

\(S(4)=s-9(4)=s-36\) and \(S(12)=s-9(12)=s-108\). Hence, \(S(4)-S(12)=(s-36)-(s-108)=72\). The terms containing \(s\) cancel, so the given condition is true for every real \(s\). Neither \(s=72\) nor \(s=9\) is a specially required value. Exam tip: while subtracting function values, use brackets carefully to avoid sign errors.

Related tags

Linear PolynomialsFunction ValuesParameter CancellationAlgebraic SimplificationLinear Growth And DecayIntroduction To PolynomialsMathematicsClass 9 Mcq

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