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If (p(x)=18+5x) and (q(x)=7x-4), when will (p(x)) and (q(x)) be equal?

Answer and explanation

Correct answer: \(x=11\)

For the two polynomials to be equal, \(18+5x=7x-4\). Subtracting \(5x\) from both sides gives \(18=2x-4\), and adding 4 gives \(22=2x\). Hence, \(x=11\). Substituting \(x=10\) does not give equal values, so it is a close but incorrect option. Exam tip: Equate the expressions first, then collect the variable terms on one side.

Related tags

Linear EquationsPolynomialsSolve For XEquality Of ExpressionsAlgebraLinear Growth And DecayIntroduction To PolynomialsMathematics

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