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Questions  >>  Olympiad-Math  >>  Class 9  >>  Polynomials
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What is the condition for one root of the quadratic equation $ax^2 +bx +c$ to be twice of each other


$( A ) c^2=4a + b^2 \\ ( B ) c^2=9a-b^2 \\ ( C ) b^2=4ac \\ ( D ) 2b^2 = 9ac$

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