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If (A(x)=12+5x), what is the value of (A(x+4)-A(x-1))?

Answer and explanation

Correct answer: \(25\)

Given \(A(x)=12+5x\), we have \(A(x+4)=12+5(x+4)\) and \(A(x-1)=12+5(x-1)\). Hence, \(A(x+4)-A(x-1)=5[(x+4)-(x-1)]=5\times5=25\). Choosing \(20\) would count only an increase of \(4\), whereas the actual difference between the two inputs is \(5\). Exam tip: for a linear function \(mx+c\), the constant term \(c\) cancels when taking a difference.

Related tags

Linear FunctionsPolynomialsFunction EvaluationInput ShiftLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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