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If (f(x)=a+9x) and (f(3)=64), what will (f(8)) be?

Answer and explanation

Correct answer: 109

The coefficient of x is 9, so f(x) increases by 9 whenever x increases by 1. From 3 to 8, x increases by 5; therefore, f(x) increases by \(5\times 9=45\). Hence, \(f(8)=f(3)+45=64+45=109\). Option 100 represents an increase of only 36, not the correct increase over 5 steps. Exam tip: for a linear function, multiply the slope by \(\Delta x\) to find the change in the function value.

Related tags

Linear FunctionFunction EvaluationAlgebraRate Of ChangePolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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