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does [7-(5+x)][7+(5-x)]=[49-(5+x)^2]? Thanks in advance.

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