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A number-related problem leads to the equation \(n^2-15n+56=0\). What is the nature of the roots of this quadratic equation?

Answer and explanation

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

For the given equation, \(a=1\), \(b=-15\), and \(c=56\). Therefore, the discriminant is \(D=b^2-4ac=(-15)^2-4(1)(56)=225-224=1\). Since \(D>0\) and 1 is a perfect square, the roots are real, rational, and distinct. Exam tip: a positive perfect-square discriminant gives two distinct rational roots; merely having \(D>0\) does not guarantee rational roots.

Related tags

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

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