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1) m^2+10m+25
m 5
m 5
(m+5)(m+5)= (m+5)^2
2) 64b^2+48bc+9c^2
8b 3c
8b 3c
(8b+3c)(8b+3c)= (8b+3c)^2
3) 9x4-6x2+1
3x^2 1
3x^2 1
(3x2+1)(3x2+1)= (3x2+1)^2
Espero te ayude.Salu2 !