Q.If (a2+b2)x2 + 2( ac + bd) x + c2+d2=0 has no real root,then
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Q.If (a2+b2)x2 + 2( ac + bd) x + c2+d2=0 has no real root,then

 Q.If (a2+b2)x2 + 2( ac + bd) x + c2+d2=0 has no real root,then

soln:-     we know that root is no real then

           
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we check options:

                 option(a)ad=bc then=0<0(not possible why ?) 

                 opotion(b) & option(c) are not related to (ad+bc) so this is not 

                  option (d) correct answer(EXPLANATION-if ad≠bc then inequality is satisfy


और अच्छा से समझने के लिए यंहा वीडियो देखे --

        

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