Respuestas

2013-11-07T20:43:56+01:00
1) (x+5)² = x² + 2x(5) + (5)² = x² + 10x + 25

2) (2x-5)
² = (2x)² + 2(2x)(5) - (5)² = 4x² + 20x - 25

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

4) (x²  - 1/2   x) ² = (x²  - x/2) ² =   (x²)² + 2(x²)(x/2) - x² =   x4 + x3 + x2