Question

(  2t - 2f )^2  cual es correcta 
4t2 + 8tf - 4f2
 4t2 - 8tf + 4ft 
-4t2 - 4tf - 4f2
 r4t2 +4tf+4f2

Answer 1

( 2t - 2f )^2 = (2t)^2 -2*2t*2f + (2f)^2 =4t^2 -8tf +4f^2 esta es la respuesta