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For which interval of \(t\) will the equation \(x^2+2tx+t+4=0\) have no real roots?

Answer and explanation

Correct answer: \(\frac{1-\sqrt{17}}{2}<t<\frac{1+\sqrt{17}}{2}\)

A quadratic has no real roots when its discriminant is negative. Here, \(D=(2t)^2-4(1)(t+4)=4(t^2-t-4)\), so we need \(t^2-t-4<0\). The zeros of this quadratic expression are \(\frac{1-\sqrt{17}}{2}\) and \(\frac{1+\sqrt{17}}{2}\). Since its leading coefficient is positive, it is negative between these zeros, excluding the endpoints. Thus, option A is correct.

Related tags

Quadratic EquationsNature Of RootsDiscriminantMathematicsClass 10 Mcq

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