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If a1x^3 + b1x² + c1x + d1 = 0 and a2x^3...

If `a_1x^3 + b_1x² + c_1x + d_1 = 0` and `a_2x^3 + b_2x^2+ c_2x + d_2 = 0` have a pair of repeated roots common, then prove that `|[3a_1,2b_1,c_1],[3a_2,2b_2,c_2],[a_2b_1-a_1b_2,c_1a_2-c_2a_1,d_1a_2-d_2a_1]|=0`

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A DAS GUPTA-Equations, Inequation and Expressions-Exercise
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