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A quantity is represented by \(P(x)=a+bx\), where it changes linearly as \(x\) increases. Which condition on \(b\) is necessary for linear decay?

Answer and explanation

Correct answer: \(b<0\)

When \(x\) rises by 1, \(P(x+1)-P(x)=b\). In decay, the quantity must decrease, so this change is negative and \(b<0\). A value of \(b=0\) represents no change. Exam tip: read \(b\) as the rate of change.

Related tags

PolynomialsLinear GrowthLinear DecayCoefficientRate Of ChangeLinear Growth And DecayIntroduction To PolynomialsMathematics

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