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What is the nature of the roots of the quadratic equation \(3x^2-2\sqrt{15}x+5=0\)?

Answer and explanation

Correct answer: Real and equal

Here, \(a=3\), \(b=-2\sqrt{15}\), and \(c=5\). The discriminant is \(D=b^2-4ac=(-2\sqrt{15})^2-4(3)(5)=60-60=0\). When \(D=0\), the two roots are real and equal. In fact, the repeated root is \(x=\frac{-b}{2a}=\frac{\sqrt{15}}{3}\). Remember that the roots may be irrational and still equal; therefore, option D is incorrect because it states that the roots are distinct.

Related tags

Quadratic EquationsNature Of RootsDiscriminantRepeated RootsSurd CoefficientMathematicsClass 10 Mcq

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