The condition that one root of the equation $a x^{2} + b x + c = 0$ may be double the other, is:

b^{2} = 9 a c

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2 b^{2} = 9 a c

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2 b^{2} = a c

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b^{2} = a c

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Solution

The correct option is B $2 b^{2} = 9 a c$
Option (b) is the correct answer. Check the video for the approach.

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