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If (A(x)=45+8x), what is the value of (A(x+6)-A(x-2))?

Answer and explanation

Correct answer: 64

Given \(A(x)=45+8x\), \(A(x+6)=45+8(x+6)\) and \(A(x-2)=45+8(x-2)\). Their difference is \(8[(x+6)-(x-2)]=8\times8=64\). The constant term 45 cancels on subtraction. Option 72 would result only if the difference between the inputs were 9; here it is 8. Exam tip: for a linear function \(mx+c\), use \(A(p)-A(q)=m(p-q)\) directly.

Related tags

Linear FunctionsFunction DifferencePolynomialsAlgebraic SubstitutionLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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