Which of the following describes all value of x for which 1-x2≥0?

A    x≤-1 or x ≥1

B    x≤-1

C    -1≤x≤1

D    x≥1

Solution

Correct Answer: Option C

 

1-x2≥0 or,(1+x)(1-x) ≥0 or,-1≤x≤1

 

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