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

Answer and explanation

Correct answer: 24

First, f(x+4)=25+6(x+4)=25+6x+24. Therefore, f(x+4)-f(x)=(25+6x+24)-(25+6x)=24. Hence, 24 is the correct option. 18 may seem tempting, but an increase of 4 units at a rate of 6 gives 6×4=24. Exam tip: For a linear function ax+b, increasing x by h always changes the function by ah.

Related tags

Linear FunctionsFunction DifferencePolynomialsRate Of ChangeAlgebraic SubstitutionLinear Growth And DecayIntroduction To PolynomialsMathematics

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