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If (A(x)=52+9x), what is the value of (A(x+7)-A(x-2))?

Answer and explanation

Correct answer: 81

The difference between the inputs is
(x+7)-(x-2)=9
. In the linear function A(x)=52+9x, the value increases by 9 for every increase of 1 in x. Therefore, for an input difference of 9, the difference in function values is 9×9=81. Choosing 72 would incorrectly treat the input difference as 8. Exam tip: in differences of a linear function, the constant term 52 cancels; use the coefficient of x and the difference between the inputs.

Related tags

Linear FunctionsPolynomial EvaluationFunction DifferenceAlgebraic SimplificationLinear GrowthLinear Growth And DecayIntroduction To PolynomialsMathematics

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