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If \(p(x)=x^2+5x+6\) and \(r(x)=p(-x)\), what are the zeroes of \(r(x)\)?

Answer and explanation

Correct answer: (2, 3)

First, \(p(x)=x^2+5x+6=(x+2)(x+3)\), so its zeroes are \(-2\) and \(-3\). Therefore, \(r(x)=p(-x)=(-x)^2+5(-x)+6=x^2-5x+6=(x-2)(x-3)\), giving the zeroes \(2\) and \(3\). Option B lists the zeroes of the original polynomial, but replacing \(x\) by \(-x\) changes the signs of the zeroes. Exam tip: In \(p(-x)\), substitute \(-x\) for every occurrence of \(x\), then factor the resulting polynomial.

Related tags

Polynomials In One VariableZeroes Of PolynomialsTransformed PolynomialsQuadratic PolynomialsReflection Of RootsPolynomialsMathematicsClass 10 Mcq

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