Question

If roots of 4x2 - X (a + 1) - 1 = 0 are two opposite numbers, then a =
(A) O
(B) 1
(C) -1
(D) 2​

Answer 1

Answer:

1 is the answer because a is equal to 1 so answer is 1

Answer 2

Answer:

The real answer is -1 because if we compare this equation with x2+x(a+b) +ab, where a+b=-b/a

and ab=c/a.

and by comparing both ab=-1

and by comparing b=1

and if the another root will -1 so

product of root=-1*1=-1