Question

(1-2x)(1+2x)+(2x+3)la puterea a doua-3(4x-1)=13

Answer 1

(1-2x)(1+2x)+(2x+3)²-3(4x-1)=13
1 - 2 x + 2 x - 4 x² + 4 x² + 12 x + 9 - 12 x + 3 = 13
- 2 x + 2 x = 0 
- 4 x² + 4 x²= 0 
+ 12 x - 12 x = 0 

1 + 9 + 3 = 13

Answer 2

(1-2x)(1+2x)+(2x+3)²-3(4x-1)=13
1 - 4x² + 4x² + 12x + 9 - 12x + 3 = 13 
1 + 9 + 3 = 13  ( adevarat )