which of the following have real roots. a)2x²+x-1=0. b)x²+x+1=0. c)x²-6x+6=0. d)2x²+15x+30=0

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which of the following have real roots. a)2x²+x-1=0. b)x²+x+1=0. c)x²-6x+6=0. d)2x²+15x+30=0

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Rose 1 month 2021-10-29T19:31:45+00:00 1 Answer 0 views 0

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    2021-10-29T19:33:14+00:00

    Answer:

    For real roots discriminant should be greater than or equal to zero,i.e.

    b²-4ac>0 or b²-4ac=0

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