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What is the nature of the roots of the quadratic equation \(x^2-13x+40=0\)?

Answer and explanation

Correct answer: Two real, rational and distinct roots \((D=9)\)

Here, \(a=1, b=-13, c=40\). Therefore, the discriminant is \(D=b^2-4ac=(-13)^2-4(1)(40)=169-160=9\). Since \(D>0\), the roots are real and distinct; because \(D=9\) is a perfect square, they are also rational. In fact, the roots are \(5\) and \(8\). Exam tip: If \(D>0\) and is a perfect square, the roots are real, distinct, and rational.

Related tags

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

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