<PRE><B>Question 442333</B>
Factor out a 2x.

2x(9x^2 -49)

Notice 9 and 49 are both perfect squares.

(3x)^2 = 9x^2 
7^2 = 49

Since this is a difference of perfect squares, then 9x^2 - 49 = (3x+7)(3x-7)

Thus {{{2x(3x+7)(3x-7)}}} is your answer.</PRE>