Question

Which of the following equations has 1 and
- 2 as the roots -
(A) x2 - x - 2 = 0
(B) x2 + x - 2 = 0
(C) x2 -- X + 2 = 0
(D) x2 + x + 2 = 0
Answer is given B I think it should be A ​

Answer 1

I think B is correct

Answer 2

Answer:

B) x^2 - x - 2 = 0

Step-by-step explanation:

Roots = 1 , -2

Sum of roots = 1 - 2

-B/A = -1

Product = 1 x (-2) = C/A

C = -2A

.'. Ax^2 + Bx + C = 0

  Ax^2 + Ax - 2A = 0

  x^2 + x - 2 = 0