Question

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

Answer 1

Answer:

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

b²-4ac>0 or b²-4ac=0