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Question

The number of integral values of m for which the equation (1+m2)x22(1+3m)x+(1+8m)=0 has no real root is :

A
2
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B
3
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C
infinitely many
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D
1
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Solution

The correct option is C infinitely many
Given quadratic equation has no real root.

D<0
4(1+3m)24(1+m2)(1+8m)<0
1+9m2+6m18mm28m3<0
8m38m2+2m>0
2m(2m1)2>0

m>0 {m12}

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