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If the equation \(x^2+qx+10=0\) has no real roots, what is the correct condition on \(q\)?

Answer and explanation

Correct answer: \(q^2<40\)

A quadratic equation has no real roots when its discriminant \(D=b^2-4ac\) is negative. Here, \(a=1\), \(b=q\), and \(c=10\), so \(D=q^2-40\). Therefore, \(q^2-40<0\), which gives \(q^2<40\). Remember that \(q^2=40\) gives equal real roots, not no real roots.

Related tags

Quadratic EquationsDiscriminantNature Of RootsParameterNo Real RootsMathematicsClass 10 Mcq

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