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If \(x^2+4\) is a factor of the polynomial \(p(x)=x^4-16\), what contribution does this factor make to the real zeroes of \(p(x)\)?

Answer and explanation

Correct answer: It gives no real zero

A factor contributes real zeroes only when it becomes zero for real values of \(x\). Here, \(x^2+4=0\) gives \(x^2=-4\), which has no real solution; its complex roots are \(x=\pm 2i\). Therefore, this factor contributes no real zero. The values \(2\) and \(-2\) come from the factor \(x^2-4\), not from \(x^2+4\). Exam tip: set each factor equal to zero and check whether its roots are real.

Related tags

PolynomialsReal-ZeroesFactorisationQuadratic-FactorsComplex-RootsPolynomials In One VariableMathematicsClass 10 Mcq

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