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In the linear polynomial model \(Q(x)=a+bx\), which condition represents decay in the quantity as \(x\) increases?

Answer and explanation

Correct answer: \(b<0\)

The coefficient \(b\) is the rate of change, or slope, per unit increase in \(x\). If \(b<0\), \(Q(x)\) decreases as \(x\) rises, so it represents decay. In contrast, \(b=0\) represents a constant quantity. Exam tip: use the sign of the slope to identify growth or decay.

Related tags

Linear PolynomialsLinear GrowthLinear DecaySlopeRate Of ChangeClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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