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What is the discriminant of \\(x^2+9x+14=0\\), and what is the nature of its roots?

Answer and explanation

Correct answer: \\(D=25\\), two real, rational and distinct roots

For a quadratic equation \\(ax^2+bx+c=0\\), the discriminant is \\(D=b^2-4ac\\). Here, \\(a=1,b=9,c=14\\), so \\(D=9^2-4(1)(14)=81-56=25\\). Since \\(D>0\\) and 25 is a perfect square, the roots are real, rational, and distinct. Therefore, option A is correct. Option B would apply only when \\(D=0\\). Exam tip: Use the sign of \\(D\\) to determine whether the roots are real and distinct, equal, or non-real; then check whether \\(D\\) is a perfect square to identify rational roots.

Related tags

Quadratic-EquationsDiscriminantNature-Of-RootsRational-RootsReal-RootsNature Of RootsQuadratic EquationsMathematics

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