Proove that if one root of the equation ax+bx+c=0 is twice the other,theen 2b(2)=9ac

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# Proove that if one root of the equation ax+bx+c=0 is twice the other,theen 2b(2)=9ac

Proove that if one root of the equation ax+bx+c=0 is twice the other,theen 2b(2)=9ac