Question

ax²+bx+c=0; where a, b, c are real numbers. What is the value of b in equation x²-x-2=0?​

Answer 1

Answer:

Given equation ax

2

+bx+c=0

Determinant of equation should be positive for its roots to be real i.e, b

2

−4ac>0 but from the options we can see that only option D is right.

Because it reduces determinant to b

2

which is always positive.