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What is the nature of the roots of the equation \(x^2-4x+8=0\)?

Answer and explanation

Correct answer: no real roots

Here, \(a=1\), \(b=-4\), and \(c=8\). The discriminant is \(D=b^2-4ac=(-4)^2-4(1)(8)=16-32=-16\). Since \(D<0\), the equation has no real roots. In fact, its roots are \(2+2i\) and \(2-2i\), which are non-real and distinct. Exam tip: For a quadratic equation, \(D<0\) means that there are no real roots.

Related tags

Quadratic EquationsNature Of RootsDiscriminantNo Real RootsClass 10 MathematicsMathematicsClass 10 Mcq

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