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If (A(x)=25+4x), what is the value of (A(x+6)-A(x-1))?

Answer and explanation

Correct answer: 28

Here, \(A(x+6)=25+4(x+6)=49+4x\) and \(A(x-1)=25+4(x-1)=21+4x\). Therefore, \(A(x+6)-A(x-1)=(49+4x)-(21+4x)=28\). Hence, 28 is correct. Option 24 would result from using a change of only 6, but the actual difference between \((x+6)\) and \((x-1)\) is 7. Exam tip: for a linear function \(a+bx\), multiply the change in input by \(b\) to quickly find the change in output.

Related tags

Linear FunctionsPolynomialsFunction EvaluationInput ShiftAlgebraic SimplificationLinear Growth And DecayIntroduction To PolynomialsMathematics

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