factorise using difference of squares

(a) -25

do i use -2ab+

(b) 9 -4

do i use

and

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- Nov 18th 2009, 02:27 AMdecoy808difference of squares
factorise using difference of squares

(a) -25

do i use -2ab+

(b) 9 -4

do i use

and - Nov 18th 2009, 03:37 AMalexmahone