Q.
If l, m, n are real and l≠m, then the roots of the equation (l-m)x2-5(l+m)x-2(l-m)=0 are
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a
Complex
b
Real and distinct
c
Real and equal
d
None of these
answer is B.
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Detailed Solution
Given equation is (l-m)x2-5(l+m)x-2(l-m)=0Its discriminant D=(l+m)2+8(l-m)2Which is positive, since l, m, n are real and l≠m.Hence roots are real and distinct.