Let the function be y=a(x-x 1)(x-x2).

Replace with (-1, 2).

a(- 1-x 1)(- 1-x2)= 2

So a (x1+1) (x2+1) = 2.

a(x 1x 2+x 1+x2+ 1)= 2

Because -2

0 & ltx2 & lt 1

So- 1

-2 & lt； x 1+x2 & lt； 0

sulphur dioxide

Because a (x1x 2+x1+x2+1) = 2.

So a person