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If (K(t)=90-4t), what is (K(t)-K(2t))?

Answer and explanation

Correct answer: \(4t\)

Given \(K(t)=90-4t\). Substituting \(2t\) for \(t\) gives \(K(2t)=90-4(2t)=90-8t\). Therefore, \(K(t)-K(2t)=(90-4t)-(90-8t)=90-4t-90+8t=4t\). Hence, \(4t\) is correct. The distractor \(-4t\) may result from not changing every sign while subtracting the second bracket. Exam tip: when finding a function at \(2t\), replace every \(t\) by \(2t\), then distribute the minus sign carefully.

Related tags

PolynomialsAlgebraic SubstitutionFunction NotationLinear ExpressionsExpression SimplificationLinear Growth And DecayIntroduction To PolynomialsMathematics

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