Question 1165612
<pre>

{{{sqrt(98x^2)=sqrt(49*2*x^2)=sqrt(49)*sqrt(2)*sqrt(x^2) = 7sqrt(2)*abs(x)}}}

We put absolute value bars around x because the square root radical √ by
convention only represents non-negative values, and if x were negative, the
result would still be positive. 

Edwin</pre>