What is the discriminant of #7x^2+8x+1=0# and what does that mean?
Answer: -1 and
In this case (a - b + c = 0) we'd better use the shortcut --> two real roots: -1 and
REMINDER OF SHORTCUT
When a + b + c = 0 -> 2 real roots: 1 and c/a
When a - b + c = 0 -> 2 real roots: -1 and -c/a