(11x)^2 - (4)^2 <= this is how you should write it before using the difference of squares; if you distribute the squared through the stuff in parentheses, you get the same thing as the original expression
(11x - 4)(11x + 4) <= difference of squares factoring
If you need more help with difference of squares, check this out: http://goo.gl/ReXat
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121x^2 - 16 <= original expression
(11x)^2 - (4)^2 <= this is how you should write it before using the difference of squares; if you distribute the squared through the stuff in parentheses, you get the same thing as the original expression
(11x - 4)(11x + 4) <= difference of squares factoring
If you need more help with difference of squares, check this out: http://goo.gl/ReXat
Hope this helps! :-)
(11x + 4)(11x - 4)
This is called the difference of squares. it is a pattern you will continue to see. memorize it
121x^2 - 16 = (11x + 4)(11x - 4)
(11x-4)(11x+4)