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IF the roots of (a^2 +b^2 ) x^2 +2 (...

IF the roots of ` (a^2 +b^2 ) x^2 +2 (bc + ad ) x +(c^2+d^2)=0` are real and equal then

A

`a//c=b//d`

B

`ac+bd =0`

C

ad+bc=0

D

`ac-bd=0`

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The correct Answer is:
D
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