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2. (3x + 2)(x - 7) - x(x - 10) = 3x² +2x -21x -14-x² +10x = 2x²-9x-14
3. (5x+7)² = (5x)² + 2.7.5x +7² = 25x² + 70x +49
4. (3x-1)² = 3x²-6x+1
5² 25
5. (2x-1)(2x+1) =4x² -2x +2x -1 = 4x² -1
6. (3x+2) (3x-2) = 9x²+6x-6x-4 = 9x²-4
7. (8x + 7)(x - 1) = 8x² +7x -8x -7 = 8x² -x -7