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What is the nature of the roots of the equation \(7x^2-9x+2=0\)?

Answer and explanation

Correct answer: Two real, rational and distinct roots \((D=25)\)

Here, \(a=7\), \(b=-9\), and \(c=2\). Therefore, the discriminant is \(D=b^2-4ac=(-9)^2-4(7)(2)=25\). Since \(D\) is positive and a perfect square, the roots are real, rational, and distinct. In fact, the roots are \(1\) and \(\frac{2}{7}\), so option A is correct. Exam tip: a positive perfect-square discriminant indicates rational and distinct roots.

Related tags

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

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