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What is the discriminant \(D\) of the quadratic equation \(6x^2-5x+1=0\)?

Answer and explanation

Correct answer: 1

In the standard form \(ax^2+bx+c=0\), \(a=6\), \(b=-5\), and \(c=1\). Thus, \(D=b^2-4ac=(-5)^2-4(6)(1)=25-24=1\), so option A is correct. Since \(D>0\), the roots are real and distinct; because \(D\) is also a perfect square, they are rational. Exam tip: always place the signed value of \(b\) in parentheses when calculating the discriminant.

Related tags

Quadratic EquationsDiscriminantNature Of RootsRational RootsMathematicsClass 10 Mcq

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