find 15x²-11x+ 2 by formula method
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it is not right. you should have 11 instead of -11 because b = -11 and
-b = 11. the roots are (11 - 1)/30 = 10/30 and (11 + 1)/30 = 12/30, that is, the roots are 1/3 and 2/5.
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