Question

How to find roots of equation when they have equal and real roots?

Answer 1

when b2-4ac = 0, the roots are real and equal

for example:

find the value of k if

3x2+2k+1=0 has real and equal roots

answer:

b2-4ac=    (2k)2-4*3*1=0

                 4k2-12=0

                  4k2=12

                  k2=12/4

                  k2=3

                   k=√3

Answer 2

B2=4ac have real and equal roots