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Find the condition so that the two equat...

Find the condition so that the two equations `a_1 x^2+b_1 x+c_1=0` and `a_2 x^2+b_2 x+c_2=0` will have a common root.

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The correct Answer is:
or `(a_2c_1-a_1c_2)^2=(b_1c_2-b_2c_1)(a_1b_2-a_2b_1)`
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