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If one root of the equaiton (l - m)x^(2)...

If one root of the equaiton `(l - m)x^(2)+ lx + 1 = 0` is double the other and I is real, then what is the greatest value of m ?

A

`-(9)/(8)`

B

`(9)/(8)`

C

`-(8)/(9)`

D

`(8)/(9)`

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The correct Answer is:
B
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