a^2 + 4ab +4b^2 = (a+2b)^2
a^2 + 8a + 16 = (a+4)^2
9m^2 - 6mn + n^2 = (3m - n)^2
m^2 - 12m + 36 = (m-6)^2
a^2 + 4ab +4b^2 = (a+2b)^2
a^2 + 8a + 16 = (a+4)^2
9m^2 - 6mn + n^2 = (3m - n)^2
m^2 - 12m + 36 = (m-6)^2