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An area-based problem leads to the equation \(r^2-10r+30=0\). What is the correct conclusion about the real values of \(r\)?

Answer and explanation

Correct answer: No real roots \((D=-20)\)

For the given quadratic equation, \(a=1\), \(b=-10\), and \(c=30\). Thus, the discriminant is \(D=b^2-4ac=(-10)^2-4(1)(30)=100-120=-20\). Since \(D<0\), the equation has no real roots. Option B would be correct only if \(D=0\). Exam tip: the sign of the discriminant directly determines the nature of the roots.

Related tags

Quadratic-EquationsNature-Of-RootsDiscriminantReal-RootsWord-ProblemsNature Of RootsQuadratic EquationsMathematics

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