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If (g(x)=420-14x), when will (g(2x)-g(6x)) be (224)?

Answer and explanation

Correct answer: \(x=4\)

Given \(g(x)=420-14x\), we get \(g(2x)=420-28x\) and \(g(6x)=420-84x\). Hence, \(g(2x)-g(6x)=(420-28x)-(420-84x)=56x\). Setting \(56x=224\) gives \(x=4\). For \(x=3\), the expression equals only \(168\), so the nearest distractor is not correct. Exam tip: when substituting \(2x\) or \(6x\) into a function, multiply every occurrence of \(x\) by that input.

Related tags

PolynomialsLinear FunctionFunction SubstitutionSolving EquationsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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