GMAT, GRE [Inequalities] With Squares

Which of the following describes all values of x for which 1–x^2 ≥ 0?

(A) x ≥ 1
(B) x ≤ –1
(C) 0 ≤ x ≤ 1
(D) x ≤ –1 or x ≥ 1
(E) –1 ≤ x ≤ 1







1−x2≥0$1-x^2\ge 0$ 

x2≤1$x^2\le 1$

−1≤x≤1$-1\le x\le 1$.


E