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A number-related problem leads to the equation \(n^2-21n+110=0\). What is the nature of the roots of this equation?

Answer and explanation

Correct answer: Two distinct real rational roots \(D=1\)

Here, \(a=1\), \(b=-21\), and \(c=110\). Thus, the discriminant is \(D=b^2-4ac=(-21)^2-4(1)(110)=441-440=1\). Since \(D>0\) and 1 is a perfect square, the equation has two distinct real rational roots. Therefore, option A is correct; equal roots occur only when \(D=0\). Exam tip: \(D>0\) indicates distinct real roots, and a perfect-square discriminant indicates that the roots are rational.

Related tags

Quadratic-EquationsNature-Of-RootsDiscriminantRational-RootsClass-10Nature Of RootsQuadratic EquationsMathematics

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