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3x (x²+2x+1) - (4x²- 1) a) (x +1)² = x +1 b) (2x+1) (2x-1)
3x³ + 6x² + 3x - 4x² +1 x + 1
3x³ + 6x² - 4x² + 3x +1 x² + x 2x+1
3x³ + 2x² + 3x + 1 +x + 1 2x -1
x² +2x + 1 4x² +2x
- 2x - 1
4x² (-) -1=4x²-1