If the equation (l + m^2)x^2 + 2mcx + (c^2 - a^2) = 0 has equal roots, help me to prove that c^2= a^2(l + m^2)..
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you can put "b^2-4ac=0
(2mc)^2-4(c^2-a^2)=0
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.and than
c^2=a^2(1+m^2)
(2mc)^2-4(c^2-a^2)=0
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.and than
c^2=a^2(1+m^2)
SweetGal:
Thanks for the answer, but it would be nice if you give me a detailed answer..( if you can )
its ok
i send you a pic later
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