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What is the discriminant \(D\) of the equation \(7x^2-10x+3=0\)?

Answer and explanation

Correct answer: 16

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=7\), \(b=-10\), and \(c=3\), so \(D=(-10)^2-4(7)(3)=100-84=16\). Therefore, the correct answer is 16. The distractor 100 results from calculating only \(b^2\) and omitting \(4ac\). Exam tip: always place a negative value of \(b\) in parentheses before squaring it.

Related tags

Quadratic EquationsDiscriminantNature Of RootsStandard FormMathematicsClass 10 Mcq

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