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 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 in progress 0 Math Arianna 4 weeks 2021-10-29T19:07:34+00:00 2021-10-29T19:07:34+00:00 2 Answers 0 views 0

## Answers ( )

Answer:x^2 +x+1=10

Step-by-step explanation:thankyou mark as brain list

The roots of the basic equation ax²+bx+c=0 are found with the quadratic formula.While all letters are real, it is required thatis real.There are three cases:Case 1. The square root of a negative number is imaginary.Case 2. The square root of 0 is zero.Case 3. The square root of a positive number is real.a) Case 3, therefore real.b) Case 1, therefore imaginary.c) Case 1, therefore imaginary.d) Case 1, therefore imaginary.So choice a) is the correct answer.