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CBSE Notes 2011-2012

CBSE Sample papers for class 10 (X)

CBSE Sample papers for 2011-2012 are available for you to go through and practice. You can download the sample papers for class 10. These sample papers give you some idea of the format you can expected in the actual question paper. They will also give you an some idea of how the questions are organized in the various sections and the level of difficulty.

Sanskrit Communicative
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English Communicative
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dev patel's picture
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Joined: 23/02/2011
ss6mpm9AMc

If the equation (1+m2 )x2 + 2mcx + (c2 - a2 )  0 has equal roots, prove that c 2 = a 2 (1 + m 2 ) .

prateekgoswami24996's picture
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Joined: 11/08/2011
answer

hey dev here is your answer

if roots are equal the let us say roots be alpha anld beta then

alpha+beta= -b/a(-2mc/1=m^2)

2*alpha= (-2mc/1+m^2)
alpha= (-mc/1+m^2)
alpha*beta=(c^2-a^2/1+m^2)
alpha^2=(c^2-a^2/1+m^2)
then
m^2c^2/(1+m^2)^2=c^2-a^2/1+m^2

m^2c^2/1+m^2=c^2-a^2
by solving this we get
c^2=a^2(1+m^2)

faheempp's picture
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Joined: 13/11/2011
english

sir please send me notes of seaven ages of class 9

faheempp's picture
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Joined: 13/11/2011
english

sir please send me notes of seaven ages of class 9

faheempp's picture
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Joined: 13/11/2011
english

please send me notes of oh i wished i look after my teeth of class 9