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In a polynomial \(P(x)=a+bx\) representing linear decay, which condition is necessary for the quantity to decrease as \(x\) increases?

Answer and explanation

Correct answer: \(b<0\)

In a linear polynomial, \(b\) is the rate of change with respect to \(x\). If \(b<0\), \(P(x)\) decreases for every increase of 1 in \(x\), so it represents decay. \(b=0\) represents a constant quantity. Exam tip: check the sign of the coefficient of \(x\).

Related tags

PolynomialsLinear DecayLinear GrowthCoefficientRate Of ChangeClass 9 MathematicsLinear Growth And DecayIntroduction To Polynomials

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