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If (p(x)=7x-30), what is (a) when (p(a)=a)?

Answer and explanation

Correct answer: 5

Given \(p(x)=7x-30\), we have \(p(a)=7a-30\). Using the condition \(p(a)=a\), \(7a-30=a\). Hence, \(6a=30\), so \(a=5\). Therefore, option B is correct. For example, if \(a=6\), then \(p(6)=12\), not 6. Exam tip: In a condition such as \(p(a)=a\), first substitute \(a\) for \(x\), then solve the resulting equation.

Related tags

PolynomialsLinear PolynomialsFixed PointSubstitutionAlgebraic EquationsIntroduction To PolynomialsMathematicsClass 9 Mcq

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