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Which pair correctly gives the discriminant \(\Delta\) and the nature of the roots of \(x^2+5x+6=0\)?

Answer and explanation

Correct answer: \(\Delta=1\), two real and distinct roots

For the given equation, \(a=1\), \(b=5\), and \(c=6\). Thus, \(\Delta=b^2-4ac=5^2-4(1)(6)=25-24=1\). Since \(\Delta>0\), the equation has two real and distinct roots. Option B would be correct only if \(\Delta=0\). In exams, calculate the discriminant first and then use its sign to determine the nature of the roots.

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsDistinct RootsMathematicsClass 10 Mcq

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