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For the quadratic equation \\(7x^2+2x+3=0\\), the discriminant is \\(D=b^2-4ac\\). What is the value of \\(D\\)?

Answer and explanation

Correct answer: -80

Comparing the equation with the standard form \\(ax^2+bx+c=0\\), we get \\(a=7\\), \\(b=2\\), and \\(c=3\\). Thus, \\(D=b^2-4ac=(2)^2-4(7)(3)=4-84=-80\\). Therefore, -80 is correct. Since \\(D<0\\), the equation has no real roots. In exams, remember to use the coefficient of \\(x\\), including its sign, when calculating \\(b^2\\).

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsClass 10MathematicsClass 10 Mcq

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