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If (f(x)=12x+50), when will (f(5x)-f(2x)) be (180)?

Answer and explanation

Correct answer: \(x=5\)

Given \(f(x)=12x+50\), we get \(f(5x)=60x+50\) and \(f(2x)=24x+50\). Therefore, \(f(5x)-f(2x)=(60x+50)-(24x+50)=36x\). Setting this equal to \(180\) gives \(36x=180\), so \(x=5\). If \(x=4\), the value is only \(144\), so it is not correct. Exam tip: substitute each input into the function first, then subtract carefully; identical constant terms cancel out.

Related tags

Linear FunctionsFunction NotationAlgebraic SubstitutionSolving Linear EquationsPolynomialsLinear Growth And DecayIntroduction To PolynomialsMathematics

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