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If (p(x)=(r-1)x^2+(r+2)x+5) is a constant polynomial, what is the correct conclusion about (r)?

Answer and explanation

Correct answer: No such \(r\) exists

For a polynomial to be constant, the coefficients of both \(x^2\) and \(x\) must be zero. Thus, \(r-1=0\) requires \(r=1\), while \(r+2=0\) requires \(r=-2\). The same value of \(r\) cannot be both 1 and −2, so no such \(r\) exists. In particular, \(r=1\) removes only the \(x^2\) term; the \(x\) term remains. Exam tip: for a constant polynomial, set the coefficient of every variable term equal to zero.

Related tags

PolynomialsConstant PolynomialCoefficientsParameterAlgebraGrade 9Definition Of A PolynomialIntroduction To Polynomials

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