<PRE><B>Question 444852</B>
{{{x^2 - 49 &lt;= 0 }}}

{{{x^2 - 7^2 &lt;= 0 }}}

{{{(x - 7)(x+7)&lt;= 0 }}}

{{{x - 7&lt;= 0 }}}......=&gt;...{{{x&lt;= 7}}} 

{{{x + 7&lt;= 0 }}}......=&gt;...{{{x&lt;= -7}}} 


C. [-7, 7] </PRE>