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If (p(x)=ax-6) and (p(2)=p(5)-9), what is (a)?

Answer and explanation

Correct answer: 3

Given \(p(x)=ax-6\), we have \(p(2)=2a-6\) and \(p(5)=5a-6\). Substituting these in \(p(2)=p(5)-9\) gives \(2a-6=(5a-6)-9\). Hence, \(2a=5a-9\), so \(3a=9\) and \(a=3\). For example, \(a=2\) does not satisfy the given condition. Exam tip: first evaluate the polynomial at each stated value of x, then form the equation carefully.

Related tags

PolynomialsLinear PolynomialCoefficientSubstitutionAlgebraic EquationsLinear PolynomialsIntroduction To PolynomialsMathematics

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