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If (p(x)=180-10x) and (q(x)=72+2x), what is (x) for (p(x)=q(x))?

Answer and explanation

Correct answer: \(x=9\)

Since \(p(x)=q(x)\), set \(180-10x=72+2x\). Subtracting 72 from both sides gives \(108-10x=2x\). Hence, \(108=12x\), so \(x=9\). If \(x=8\) is substituted, the two expressions do not have equal values, so it is a close but incorrect option. Exam tip: equate the two polynomials first, then collect all \(x\)-terms on one side.

Related tags

Linear EquationsPolynomialsSolving For XGrowth And DecayAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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