Which trinomials are perfect square trinomials?

Select each correct answer.

A. m^2 + 10m + 100

B. m^2 + 10m + 25

C. m^2 + 36m + 60

D. m^2 + 24m + 144

Perfect square is

a²+2ab+b²

so just take the square root of the end ones and add then double to get middle term

A.

m+10=10m, doubled is 20m

nope

B.

m+5=5m, doubled is 10m, yep

C.

m+2√15=fancy thing that won't get to 36m

D.

m+12=12m, doubled is 24m, yep

B and D