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What condition on \(a\) is required for the equation \(x^2+2(a+3)x+a^2+10a+17=0\) to have no real roots?

Answer and explanation

Correct answer: \(a>-2\)

A quadratic equation has no real roots when its discriminant satisfies \(D<0\). Here, \(D=[2(a+3)]^2-4(a^2+10a+17)=-16(a+2)\). Therefore, \(-16(a+2)<0\), which gives \(a>-2\). At \(a=-2\), \(D=0\), so the equation has equal real roots rather than no real roots. Exam tip: simplify the discriminant completely before applying its sign condition.

Related tags

Quadratic EquationsNature Of RootsDiscriminantParameter InequalityNo Real RootsMathematicsClass 10 Mcq

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