Explicación paso a paso:
a) ( 5+m)^2 = (5)^2 + 2.5.m + (m)^2 =
25 + 10m + m^2
b)(2x+3 )^2 = (2x)^2 + 2.2x.3 + (3)^2 =
4x^2 + 12x + 9
c) (3x-5 )^2 = (3x)^2 + 2.(3x).(5) + (5)^2 =
9x^2 + 30x + 25
d).(4m-5 )^2 = (4m)^2 + 2.4m.5 + (5)^2 =
16m^2 + 40m + 25
