Question

Calcule os quadrados:
(2t+1).(2t-1)=

Answer 1

(2t+1) . (2t+1) 
2t . 2t= 4t² 

2t . 1 = 2t 

1. 2t = 2t 

1 . 1 = 1 

4t² + 2t + 2t + 1

4t² +4t+1 

Answer 2

(2t+1)(2t-1)
(2t)²-1.2t+1.2t+1.(-1)
4t²-2t+2t-1
4t²-1