# Math Help - help with difference of square?

1. ## help with difference of square?

does [7-(5+x)][7+(5-x)]=[49-(5+x)^2]?

2. Originally Posted by antikv
does [7-(5+x)][7+(5-x)]=[49-(5+x)^2]?
$a^2-b^2=[a-b][a+b]$ where $a=7~\&~b=(5+x)$