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What is the nature of the roots of \\(8x^2-4\sqrt{10}x+5=0\\)?

Answer and explanation

Correct answer: Two real and equal \\(D=0\\)

For a quadratic equation, the discriminant is \\(D=b^2-4ac\\). Here, \\(a=8, b=-4\sqrt{10}, c=5\\), so \\(D=(-4\sqrt{10})^2-4(8)(5)=160-160=0\\). Therefore, the roots are real and equal. In fact, the repeated root is \\(x=\frac{\sqrt{10}}{4}\\), which is irrational; however, option D is still incorrect because it says the roots are distinct. Exam tip: \\(D=0\\) always indicates two equal real roots.

Related tags

Quadratic-EquationsNature-Of-RootsDiscriminantSurd-CoefficientsEqual-RootsNature Of RootsQuadratic EquationsMathematics

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