Which of the following describes all values of x for which 9-x^2 ≥ 0 ?  Pick:  A) x ≥ 1  B) x ≤ -1  C) 0 ≤ x ≤ 1  D) x ≤ -1 or x ≥ 1  E) -3 ≤ x ≤ 3
9-x^2 &gt;= 0 ---&gt; x^2-9&lt;=0   --&gt; (x+3)(x-3)&lt;=0   Above equation true for   i) x+3&lt;=0 and x-3&gt;=0 ---&gt; x&lt;= -3 and x&gt;=3 ---&gt; this is not possible ---Strike out this solution   ii) x+3&gt;=0 and x-3&lt;=0 ---&gt; x&gt;=-3 and x&lt;=3 --&gt; -3&lt;=x&lt;=3   Answer -3 ≤ x ≤ 3
<result>E</result>
Which of the following describes all values of x for which 9-x^2 ≥ 0 ?