Respuestas

2012-10-07T01:46:50+02:00

(A+B)(A-B)=A²-B²

 

(X-Y)(X+Y)=X²-Y²

(M-P)(M+P)=

(B+D)(B-D)=

 

SUERTE!!!!!

2012-10-07T01:56:37+02:00

#1. ( 5x +9) (5x – 9)= (5x)^2 - (9)^2 = 25x^2 -81

#2. (2d - 1)(1 + 2d) = (2d)^2 - 81)^2 = 4d^2 - 1

 

 :)