Bi and Trinomials

[dtweah]

For which of the following expressions is it true that the value of the expression is the same for x = 587 as for x = -587 ?

I. 1 - 2x
II. 1 - 2x^2
III. (1 - 2x)2

(A) I only
(B) II only
(C) I and III only
(D) II and III only
(E) I, II, and III

[sacx]

if you substitude x = 587 and -587 in all the 3 expressions you will find only II will give you the same value, since when x is squared - it really doesn't matter whether x is negative or positive - the result will always be postive.

B