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What is the nature of the roots of the equation \(5x^2-20x+20=0\)?

Answer and explanation

Correct answer: Real and equal

Here, \(a=5, b=-20, c=20\). The discriminant is \(D=b^2-4ac=(-20)^2-4(5)(20)=400-400=0\). Therefore, the roots are real and equal. In fact, the equation becomes \(5(x-2)^2=0\), so both roots are \(x=2\). Exam tip: \(D=0\) gives real and equal roots, whereas \(D>0\) gives distinct real roots.

Related tags

Quadratic EquationsNature Of RootsDiscriminantEqual RootsReal RootsMathematicsClass 10 Mcq

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