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1. 
SOLUCIONA: x2+4xy+9y2=
A.
(12+7N3+3N6) (12-7N3+3N6)
B.
(8A2+5AB2-9B4) (8A2-5AB2+9B4)
C.
(X2Y2+XY+12) (X2Y2-XY+12)
D.
(4+C2-C4) (4-C2-C4)
2. 
SOLUCIONA: 16-9C4+C8=
A.
(X2Y2+XY+12) (X2Y2-XY+12)
B.
(8A2+5AB2-9B4) (8A2-5AB2+9B4)
C.
(4+C2-C4) (4-C2-C4)
D.
(M2+5M+15) (M2-5M+15)
3. 
SOLUCIONA: 64A4-169A2B4+81B8=
A.
(12+7N3+3N6) (12-7N3+3N6)
B.
(X2Y2+XY+12) (X2Y2-XY+12)
C.
(4+C2-C4) (4-C2-C4)
D.
(8A2+5AB2-9B4) (8A2-5AB2-9B4)
4. 
SOLUCIONA: 225+5M2+M4=
A.
(8A2+5AB2-9B4) (8A2-5AB2-9B4)
B.
(X2Y2+XY+12) (X2Y2-XY+12)
C.
(M2+5M+15) (M2-5M+15)
D.
(12+7N3+3N6) (12-7N3+3N6)
5. 
SOLUCIONA: X4Y4+21X2Y2+121=
A.
(X2Y2+XY+12) (X2Y2-XY+12)
B.
(8A2+5AB2-9B4) (8A2-5AB2+9B4)
C.
(M2+5M+15) (M2-5M+15)
D.
(12+7N3+3N6) (12-7N3+3N6)