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What is the nature of the roots of the equation \(x^2-19x+90=0\)?

Answer and explanation

Correct answer: Two real, rational and distinct roots (\(\Delta=1\))

Here, \(a=1\), \(b=-19\), and \(c=90\). Therefore, the discriminant is \(\Delta=b^2-4ac=(-19)^2-4(1)(90)=361-360=1\). Since \(\Delta\) is positive and a perfect square, the roots are real, rational, and distinct; in fact, they are 9 and 10. Option B would require \(\Delta=0\). Exam tip: \(\Delta>0\) indicates distinct real roots, and a perfect-square discriminant indicates that they are rational.

Related tags

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

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